--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1632,30 +1632,30 @@ name = "gkrust_utils"
 version = "0.1.0"
 dependencies = [
  "nsstring",
  "uuid 0.8.1",
 ]
 
 [[package]]
 name = "gl_generator"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a23d5e872a275135d66895d954269cf5e8661d234eb1c2480f4ce0d586acbd"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a95dfc23a2b4a9a2f5ab41d194f8bfda3cabec42af4e39f08c339eb2a0c124d"
 dependencies = [
  "khronos_api",
  "log",
  "xml-rs",
 ]
 
 [[package]]
 name = "gleam"
-version = "0.6.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f46fd8874e043ffac0d638ed1567a2584f7814f6d72b4db37ab1689004a26c4"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "332d1f4e6c6181ed07178f84a552b2387d43ecf6821a86c22cfb3883ea3fb1b9"
 dependencies = [
  "gl_generator",
 ]
 
 [[package]]
 name = "glean-core"
 version = "24.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"

--- a/gfx/webrender_bindings/Cargo.toml
+++ b/gfx/webrender_bindings/Cargo.toml
@@ -8,17 +8,17 @@ license = "MPL-2.0"
 webrender_debugger = ["webrender/debugger"]
 
 [dependencies]
 rayon = "1"
 num_cpus = "1.7.0"
 thread_profiler = "0.1.1"
 euclid = { version = "0.20.0", features = ["serde"] }
 app_units = "0.7"
-gleam = "0.6.14"
+gleam = "0.9.2"
 log = "0.4"
 nsstring = { path = "../../xpcom/rust/nsstring" }
 bincode = "1.0"
 uuid = { version = "0.8", features = ["v4"] }
 fxhash = "0.2.1"
 
 [dependencies.webrender]
 path = "../wr/webrender"

--- a/gfx/wr/Cargo.lock
+++ b/gfx/wr/Cargo.lock
@@ -183,17 +183,17 @@ name = "cfg-if"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cgl"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "clap"
 version = "2.31.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -237,17 +237,17 @@ dependencies = [
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "compositor"
 version = "0.1.0"
 dependencies = [
  "compositor-windows 0.1.0",
- "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "webrender 0.61.0",
 ]
 
 [[package]]
 name = "compositor-windows"
 version = "0.1.0"
 dependencies = [
  "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -410,17 +410,17 @@ dependencies = [
  "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "direct-composition"
 version = "0.1.0"
 dependencies = [
  "euclid 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "mozangle 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "webrender 0.61.0",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "dlib"
@@ -588,21 +588,39 @@ version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "khronos_api 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "gleam"
-version = "0.6.17"
+name = "gl_generator"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "khronos_api 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gleam"
+version = "0.6.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl_generator 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gleam"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl_generator 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "glutin"
 version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "android_glue 0.2.3 (git+https://github.com/rust-windowing/android-rs-glue.git?rev=e3ac6edea5814e1faca0c31ea8fac6877cb929ea)",
@@ -1748,17 +1766,17 @@ dependencies = [
  "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-text 13.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cstr 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "dwrote 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "freetype 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.22.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "malloc_size_of_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mozangle 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "plane-split 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1782,17 +1800,17 @@ dependencies = [
 [[package]]
 name = "webrender-examples"
 version = "0.1.0"
 dependencies = [
  "app_units 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "webrender 0.61.0",
  "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "webrender_api"
@@ -1909,17 +1927,17 @@ dependencies = [
  "clap 2.31.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "dwrote 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "font-loader 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.22.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mozangle 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "osmesa-src 0.1.1 (git+https://github.com/servo/osmesa-src)",
  "osmesa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ron 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2054,17 +2072,19 @@ dependencies = [
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
 "checksum gdi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0912515a8ff24ba900422ecda800b52f4016a56251922d397c576bf92c690518"
 "checksum generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c0f28c2f5bfb5960175af447a2da7c18900693738343dc896ffbcabd9839592"
 "checksum gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "39a23d5e872a275135d66895d954269cf5e8661d234eb1c2480f4ce0d586acbd"
 "checksum gl_generator 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ca98bbde17256e02d17336a6bdb5a50f7d0ccacee502e191d3e3d0ec2f96f84a"
-"checksum gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)" = "7f46fd8874e043ffac0d638ed1567a2584f7814f6d72b4db37ab1689004a26c4"
+"checksum gl_generator 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1a95dfc23a2b4a9a2f5ab41d194f8bfda3cabec42af4e39f08c339eb2a0c124d"
+"checksum gleam 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)" = "cae10d7c99d0e77b4766e850a60898a17c1abaf01075531f1066f03dc7dc5fc5"
+"checksum gleam 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "332d1f4e6c6181ed07178f84a552b2387d43ecf6821a86c22cfb3883ea3fb1b9"
 "checksum glutin 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cb26027a84c3b9e1949ef0df0b6a3db8d0c124243a5c161ea25c7def90cb1474"
 "checksum glutin_egl_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "23f48987ab6cb2b61ad903b59e54a2fd0c380a7baff68cffd6826b69a73dd326"
 "checksum glutin_emscripten_sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "245b3fdb08df6ffed7585365851f8404af9c7e2dd4b59f15262e968b6a95a0c7"
 "checksum glutin_gles2_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "89996c30857ae1b4de4b5189abf1ea822a20a9fe9e1c93e5e7b862ff0bdd5cdf"
 "checksum glutin_glx_sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "1290a5ca5e46fcfa7f66f949cc9d9194b2cb6f2ed61892c8c2b82343631dba57"
 "checksum glutin_wgl_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "f801bbc91efc22dd1c4818a47814fc72bf74d024510451b119381579bfa39021"
 "checksum httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c2f407128745b78abc95c0ffbe4e5d37427fdc0d45470710cfef8c44522a2e37"
 "checksum humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0484fda3e7007f2a4a0d9c3a703ca38c71c54c55602ce4660c419fd32e188c9e"

--- a/gfx/wr/direct-composition/Cargo.toml
+++ b/gfx/wr/direct-composition/Cargo.toml
@@ -2,13 +2,13 @@
 name = "direct-composition"
 version = "0.1.0"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 license = "MPL-2.0"
 edition = "2018"
 
 [target.'cfg(windows)'.dependencies]
 euclid = "0.20"
-gleam = "0.6.2"
+gleam = "0.9.2"
 mozangle = {version = "0.3.1", features = ["egl"]}
 webrender = {path = "../webrender"}
 winapi = {version = "0.3", features = ["winerror", "d3d11", "dcomp"]}
 winit = "0.19"

--- a/gfx/wr/example-compositor/compositor/Cargo.toml
+++ b/gfx/wr/example-compositor/compositor/Cargo.toml
@@ -2,12 +2,12 @@
 name = "compositor"
 version = "0.1.0"
 authors = ["Glenn Watson <gw@intuitionlibrary.com>"]
 edition = "2018"
 license = "MPL-2.0"
 
 [dependencies]
 webrender = { path = "../../webrender" }
-gleam = "0.6.2"
+gleam = "0.9.2"
 
 [target.'cfg(windows)'.dependencies]
 compositor-windows = { path = "../compositor-windows" }

--- a/gfx/wr/examples/Cargo.toml
+++ b/gfx/wr/examples/Cargo.toml
@@ -56,16 +56,16 @@ path = "yuv.rs"
 
 [features]
 debug = ["webrender/capture", "webrender/debugger", "webrender/profiler"]
 
 [dependencies]
 app_units = "0.7"
 env_logger = "0.5"
 euclid = "0.20"
-gleam = "0.6.2"
+gleam = "0.9.2"
 glutin = "0.21"
 rayon = "1"
 webrender = { path = "../webrender" }
 winit = "0.19"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-foundation = "0.6.4"

--- a/gfx/wr/webrender/Cargo.toml
+++ b/gfx/wr/webrender/Cargo.toml
@@ -27,17 +27,17 @@ webrender_build = { version = "0.0.1", p
 base64 = { optional = true, version = "0.10" }
 bincode = "1.0"
 bitflags = "1.2"
 byteorder = "1.0"
 cfg-if = "0.1.2"
 cstr = "0.1.2"
 euclid = { version = "0.20.0", features = ["serde"] }
 fxhash = "0.2.1"
-gleam = "0.6.17"
+gleam = "0.9.2"
 image_loader = { optional = true, version = "0.22", package = "image", default-features = false, features = ["png_codec"] }
 lazy_static = "1"
 log = "0.4"
 malloc_size_of_derive = "0.1"
 num-traits = "0.2"
 plane-split = "0.15"
 png = { optional = true, version = "0.15" }
 rayon = "1"

--- a/gfx/wr/webrender/src/device/gl.rs
+++ b/gfx/wr/webrender/src/device/gl.rs
@@ -944,16 +944,18 @@ pub struct Capabilities {
     /// Whether KHR_debug is supported for getting debug messages from
     /// the driver.
     pub supports_khr_debug: bool,
     /// Whether we can configure texture units to do swizzling on sampling.
     pub supports_texture_swizzle: bool,
     /// Whether the driver supports uploading to textures from a non-zero
     /// offset within a PBO.
     pub supports_nonzero_pbo_offsets: bool,
+    /// Whether the driver supports specifying the texture usage up front.
+    pub supports_texture_usage: bool,
 }
 
 #[derive(Clone, Debug)]
 pub enum ShaderError {
     Compilation(String, String), // name, error message
     Link(String, String),        // name, error message
 }
 
@@ -1304,16 +1306,18 @@ impl Device {
                 panic!("Caught GL error {:x} at {}", code, name);
             });
         }
 
         if supports_extension(&extensions, "GL_ANGLE_provoking_vertex") {
             gl.provoking_vertex_angle(gl::FIRST_VERTEX_CONVENTION);
         }
 
+        let supports_texture_usage = supports_extension(&extensions, "GL_ANGLE_texture_usage");
+
         // Our common-case image data in Firefox is BGRA, so we make an effort
         // to use BGRA as the internal texture storage format to avoid the need
         // to swizzle during upload. Currently we only do this on GLES (and thus
         // for Windows, via ANGLE).
         //
         // On Mac, Apple docs [1] claim that BGRA is a more efficient internal
         // format, but they don't support it with glTextureStorage. As a workaround,
         // we pretend that it's RGBA8 for the purposes of texture transfers,
@@ -1475,16 +1479,17 @@ impl Device {
                 supports_multisampling: false, //TODO
                 supports_copy_image_sub_data,
                 supports_blit_to_texture_array,
                 supports_pixel_local_storage,
                 supports_advanced_blend_equation,
                 supports_khr_debug,
                 supports_texture_swizzle,
                 supports_nonzero_pbo_offsets,
+                supports_texture_usage,
             },
 
             color_formats,
             bgra_formats,
             swizzle_settings: SwizzleSettings {
                 bgra8_sampling_swizzle,
             },
 
@@ -2079,16 +2084,20 @@ impl Device {
             fbos_with_depth: vec![],
             blit_workaround_buffer: None,
             last_frame_used: self.frame_id,
             flags: TextureFlags::default(),
         };
         self.bind_texture(DEFAULT_TEXTURE, &texture, Swizzle::default());
         self.set_texture_parameters(texture.target, filter);
 
+        if self.capabilities.supports_texture_usage && render_target.is_some() {
+            self.gl.tex_parameter_i(texture.target, gl::TEXTURE_USAGE_ANGLE, gl::FRAMEBUFFER_ATTACHMENT_ANGLE as gl::GLint);
+        }
+
         // Allocate storage.
         let desc = self.gl_describe_format(texture.format);
         let is_array = match texture.target {
             gl::TEXTURE_2D_ARRAY => true,
             gl::TEXTURE_2D | gl::TEXTURE_RECTANGLE | gl::TEXTURE_EXTERNAL_OES => false,
             _ => panic!("BUG: Unexpected texture target!"),
         };
         assert!(is_array || texture.layer_count == 1);

--- a/gfx/wr/wrench/Cargo.toml
+++ b/gfx/wr/wrench/Cargo.toml
@@ -7,17 +7,17 @@ license = "MPL-2.0"
 edition = "2018"
 
 [dependencies]
 base64 = "0.10"
 bincode = "1.0"
 byteorder = "1.0"
 env_logger = { version = "0.5", optional = true }
 euclid = "0.20"
-gleam = "0.6.2"
+gleam = "0.9.2"
 glutin = "0.21"
 app_units = "0.7"
 clap = { version = "2", features = ["yaml"] }
 log = "0.4"
 yaml-rust = "0.4"
 serde_json = "1.0"
 ron = "0.1.5"
 time = "0.1"

--- a/third_party/rust/gl_generator/.cargo-checksum.json
+++ b/third_party/rust/gl_generator/.cargo-checksum.json
@@ -1,1 +1,1 @@
-{"files":{"Cargo.toml":"e1a5f54814bdc0073585819a8bf8cbdba3e9b1cfb7fa1a5bd7fbb8d8670a3673","README.md":"52d8fee4681c879f2c964fd30e3faf0c907e8bf676eab7b44beab5c5bbd5c284","generators/debug_struct_gen.rs":"73164956c9c5fe848a568aac1a7518947a0786ad6118618d78b4f0208c3f442e","generators/global_gen.rs":"486384b1d7fc234dbe55815bd99e5fbd69144f361f8cefdf4aa9841db1d7832a","generators/mod.rs":"100a1da965bf11eaa9fad48a06c7856b60f48363a4a707e34ba97938bedae0b8","generators/static_gen.rs":"925a9401e27358a466baadfb660056a24394cf2fa21f5613e2d7f50ab8935e71","generators/static_struct_gen.rs":"eb08e6e59b0e0947c4ab263a0749efbb28430c5741634c413a2be011fcdad88f","generators/struct_gen.rs":"13444b524e992d88fdd2f4b0990e06bdee292b076047b274b7f607f3de12a85d","generators/templates/types/egl.rs":"d1785a30f1098e101302ba74ba4c22cf95ac44b17edf221dbb9d890f4bd635a2","generators/templates/types/gl.rs":"f71f3a2200c0fa13f09687ef05e51c28c5b11c1bb841acd402c0097d8f9130bd","generators/templates/types/glx.rs":"f444166d117b96afed2d8d13db6cd3369d6c59704f296e76202269f411bbd4a8","generators/templates/types/wgl.rs":"9d626e0959374c694c19a36d4dd34dae2f37acf3cb94e9bd4d242a16b41a970d","lib.rs":"6f47da878479b503b5202bda84ad8935607264ac03c0b68203109fad9cd479db","registry/mod.rs":"84eed5c113b322e5267b2b130987e6bb726b4e7c38ce50292cd6cc57b8e06994","registry/parse.rs":"c201ee463663878d4546a7d94194303a3d3c27f2bcb2cdbedd892f0446583795"},"package":"39a23d5e872a275135d66895d954269cf5e8661d234eb1c2480f4ce0d586acbd"}
\ No newline at end of file
+{"files":{"Cargo.toml":"f586015aa2816b3c34d89f5e6a6539172efcd7f3ed055a0fab433ea83e2a0f0f","README.md":"52d8fee4681c879f2c964fd30e3faf0c907e8bf676eab7b44beab5c5bbd5c284","generators/debug_struct_gen.rs":"6fecccf8e57d4be93ea2657328d6e111ca44bc69542a5522cd7360d80ca64630","generators/global_gen.rs":"1696013af16bb92a3fa7cf3802a57ec6f7ba460322ede33aa2af30fc9911bd98","generators/mod.rs":"100a1da965bf11eaa9fad48a06c7856b60f48363a4a707e34ba97938bedae0b8","generators/static_gen.rs":"925a9401e27358a466baadfb660056a24394cf2fa21f5613e2d7f50ab8935e71","generators/static_struct_gen.rs":"eb08e6e59b0e0947c4ab263a0749efbb28430c5741634c413a2be011fcdad88f","generators/struct_gen.rs":"fa1bcda4501a597922be7c7ef4ad13738536a9c97529996671e264acd709c680","generators/templates/types/egl.rs":"d1785a30f1098e101302ba74ba4c22cf95ac44b17edf221dbb9d890f4bd635a2","generators/templates/types/gl.rs":"d72f91355febec875c40899a44c5575bd04993f7cf5c6e289eec872a2a161b20","generators/templates/types/glx.rs":"f444166d117b96afed2d8d13db6cd3369d6c59704f296e76202269f411bbd4a8","generators/templates/types/wgl.rs":"9d626e0959374c694c19a36d4dd34dae2f37acf3cb94e9bd4d242a16b41a970d","lib.rs":"6f47da878479b503b5202bda84ad8935607264ac03c0b68203109fad9cd479db","registry/mod.rs":"84eed5c113b322e5267b2b130987e6bb726b4e7c38ce50292cd6cc57b8e06994","registry/parse.rs":"5cb781082014f143b06ef7d3678f3c4ca59133a5732d4e136fd750b78fb9453f"},"package":"1a95dfc23a2b4a9a2f5ab41d194f8bfda3cabec42af4e39f08c339eb2a0c124d"}
\ No newline at end of file

--- a/third_party/rust/gl_generator/Cargo.toml
+++ b/third_party/rust/gl_generator/Cargo.toml
@@ -7,17 +7,17 @@
 #
 # If you believe there's an error in this file please file an
 # issue against the rust-lang/cargo repository. If you're
 # editing this file be aware that the upstream Cargo.toml
 # will likely look very different (and much more reasonable)
 
 [package]
 name = "gl_generator"
-version = "0.11.0"
+version = "0.14.0"
 authors = ["Brendan Zabarauskas <bjzaba@yahoo.com.au>", "Corey Richardson", "Arseny Kapoulkine"]
 description = "Code generators for creating bindings to the Khronos OpenGL APIs."
 homepage = "https://github.com/brendanzab/gl-rs/"
 documentation = "https://docs.rs/gl_generator"
 readme = "README.md"
 keywords = ["gl", "egl", "opengl", "khronos"]
 categories = ["api-bindings", "rendering::graphics-api"]
 license = "Apache-2.0"

--- a/third_party/rust/gl_generator/generators/debug_struct_gen.rs
+++ b/third_party/rust/gl_generator/generators/debug_struct_gen.rs
@@ -182,17 +182,17 @@ where
             /// use of functions like `glfwGetProcAddress` or `SDL_GL_GetProcAddress`.
             ///
             /// ~~~ignore
             /// let gl = Gl::load_with(|s| glfw.get_proc_address(s));
             /// ~~~
             #[allow(dead_code, unused_variables)]
             pub fn load_with<F>(mut loadfn: F) -> {api} where F: FnMut(&'static str) -> *const __gl_imports::raw::c_void {{
                 #[inline(never)]
-                fn do_metaloadfn(loadfn: &mut FnMut(&'static str) -> *const __gl_imports::raw::c_void,
+                fn do_metaloadfn(loadfn: &mut dyn FnMut(&'static str) -> *const __gl_imports::raw::c_void,
                                  symbol: &'static str,
                                  symbols: &[&'static str])
                                  -> *const __gl_imports::raw::c_void {{
                     let mut ptr = loadfn(symbol);
                     if ptr.is_null() {{
                         for &sym in symbols {{
                             ptr = loadfn(sym);
                             if !ptr.is_null() {{ break; }}

--- a/third_party/rust/gl_generator/generators/global_gen.rs
+++ b/third_party/rust/gl_generator/generators/global_gen.rs
@@ -58,17 +58,17 @@ where
 fn write_metaloadfn<W>(dest: &mut W) -> io::Result<()>
 where
     W: io::Write,
 {
     writeln!(
         dest,
         r#"
         #[inline(never)]
-        fn metaloadfn(loadfn: &mut FnMut(&'static str) -> *const __gl_imports::raw::c_void,
+        fn metaloadfn(loadfn: &mut dyn FnMut(&'static str) -> *const __gl_imports::raw::c_void,
                       symbol: &'static str,
                       fallbacks: &[&'static str]) -> *const __gl_imports::raw::c_void {{
             let mut ptr = loadfn(symbol);
             if ptr.is_null() {{
                 for &sym in fallbacks {{
                     ptr = loadfn(sym);
                     if !ptr.is_null() {{ break; }}
                 }}
@@ -280,25 +280,30 @@ where
                   "
         /// Load each OpenGL symbol using a custom load function. This allows for the
         /// use of functions like `glfwGetProcAddress` or `SDL_GL_GetProcAddress`.
         /// ~~~ignore
         /// gl::load_with(|s| glfw.get_proc_address(s));
         /// ~~~
         #[allow(dead_code)]
         pub fn load_with<F>(mut loadfn: F) where F: FnMut(&'static str) -> *const __gl_imports::raw::c_void {{
+            #[inline(never)]
+            fn inner(loadfn: &mut dyn FnMut(&'static str) -> *const __gl_imports::raw::c_void) {{
     "));
 
     for c in &registry.cmds {
         try!(writeln!(
             dest,
-            "{cmd_name}::load_with(&mut loadfn);",
+            "{cmd_name}::load_with(&mut *loadfn);",
             cmd_name = &c.proto.ident[..]
         ));
     }
 
     writeln!(
         dest,
         "
+            }}
+
+            inner(&mut loadfn)
         }}
     "
     )
 }

--- a/third_party/rust/gl_generator/generators/struct_gen.rs
+++ b/third_party/rust/gl_generator/generators/struct_gen.rs
@@ -182,17 +182,17 @@ where
             /// use of functions like `glfwGetProcAddress` or `SDL_GL_GetProcAddress`.
             ///
             /// ~~~ignore
             /// let gl = Gl::load_with(|s| glfw.get_proc_address(s));
             /// ~~~
             #[allow(dead_code, unused_variables)]
             pub fn load_with<F>(mut loadfn: F) -> {api} where F: FnMut(&'static str) -> *const __gl_imports::raw::c_void {{
                 #[inline(never)]
-                fn do_metaloadfn(loadfn: &mut FnMut(&'static str) -> *const __gl_imports::raw::c_void,
+                fn do_metaloadfn(loadfn: &mut dyn FnMut(&'static str) -> *const __gl_imports::raw::c_void,
                                  symbol: &'static str,
                                  symbols: &[&'static str])
                                  -> *const __gl_imports::raw::c_void {{
                     let mut ptr = loadfn(symbol);
                     if ptr.is_null() {{
                         for &sym in symbols {{
                             ptr = loadfn(sym);
                             if !ptr.is_null() {{ break; }}

--- a/third_party/rust/gl_generator/generators/templates/types/gl.rs
+++ b/third_party/rust/gl_generator/generators/templates/types/gl.rs
@@ -41,37 +41,37 @@ pub type GLuint64EXT = u64;
 
 pub enum __GLsync {}
 pub type GLsync = *const __GLsync;
 
 // compatible with OpenCL cl_context
 pub enum _cl_context {}
 pub enum _cl_event {}
 
-pub type GLDEBUGPROC = extern "system" fn(source: GLenum,
-                                          gltype: GLenum,
-                                          id: GLuint,
-                                          severity: GLenum,
-                                          length: GLsizei,
-                                          message: *const GLchar,
-                                          userParam: *mut super::__gl_imports::raw::c_void);
-pub type GLDEBUGPROCARB = extern "system" fn(source: GLenum,
-                                             gltype: GLenum,
-                                             id: GLuint,
-                                             severity: GLenum,
-                                             length: GLsizei,
-                                             message: *const GLchar,
-                                             userParam: *mut super::__gl_imports::raw::c_void);
-pub type GLDEBUGPROCKHR = extern "system" fn(source: GLenum,
-                                             gltype: GLenum,
-                                             id: GLuint,
-                                             severity: GLenum,
-                                             length: GLsizei,
-                                             message: *const GLchar,
-                                             userParam: *mut super::__gl_imports::raw::c_void);
+pub type GLDEBUGPROC = Option<extern "system" fn(source: GLenum,
+                                                 gltype: GLenum,
+                                                 id: GLuint,
+                                                 severity: GLenum,
+                                                 length: GLsizei,
+                                                 message: *const GLchar,
+                                                 userParam: *mut super::__gl_imports::raw::c_void)>;
+pub type GLDEBUGPROCARB = Option<extern "system" fn(source: GLenum,
+                                                    gltype: GLenum,
+                                                    id: GLuint,
+                                                    severity: GLenum,
+                                                    length: GLsizei,
+                                                    message: *const GLchar,
+                                                    userParam: *mut super::__gl_imports::raw::c_void)>;
+pub type GLDEBUGPROCKHR = Option<extern "system" fn(source: GLenum,
+                                                    gltype: GLenum,
+                                                    id: GLuint,
+                                                    severity: GLenum,
+                                                    length: GLsizei,
+                                                    message: *const GLchar,
+                                                    userParam: *mut super::__gl_imports::raw::c_void)>;
 
 // GLES 1 types
 // "pub type GLclampx = i32;",
 
 // GLES 1/2 types (tagged for GLES 1)
 // "pub type GLbyte = i8;",
 // "pub type GLubyte = u8;",
 // "pub type GLfloat = GLfloat;",
@@ -93,16 +93,16 @@ pub type GLDEBUGPROCKHR = extern "system
 // "pub type GLint64EXT = i64;",
 // "pub type GLuint64EXT = u64;",
 // "pub type GLintptr = intptr_t;",
 // "pub type GLsizeiptr = ssize_t;",
 
 // GLES 2 types (none currently)
 
 // Vendor extension types
-pub type GLDEBUGPROCAMD = extern "system" fn(id: GLuint,
-                                             category: GLenum,
-                                             severity: GLenum,
-                                             length: GLsizei,
-                                             message: *const GLchar,
-                                             userParam: *mut super::__gl_imports::raw::c_void);
+pub type GLDEBUGPROCAMD = Option<extern "system" fn(id: GLuint,
+                                                    category: GLenum,
+                                                    severity: GLenum,
+                                                    length: GLsizei,
+                                                    message: *const GLchar,
+                                                    userParam: *mut super::__gl_imports::raw::c_void)>;
 pub type GLhalfNV = super::__gl_imports::raw::c_ushort;
 pub type GLvdpauSurfaceNV = GLintptr;

--- a/third_party/rust/gl_generator/registry/parse.rs
+++ b/third_party/rust/gl_generator/registry/parse.rs
@@ -196,17 +196,17 @@ fn make_egl_enum(ident: String, ty: Opti
                 let value = working[i + 1..].to_string();
 
                 (Cow::Owned(ty), value, true)
             } else {
                 panic!("Unexpected value format: {}", value)
             }
         } else {
             match value.chars().next() {
-                Some('-') | Some('0'...'9') => (),
+                Some('-') | Some('0'..='9') => (),
                 _ => panic!("Unexpected value format: {}", value),
             }
 
             let ty = match ty {
                 Some(ref ty) if ty == "ull" => "EGLuint64KHR",
                 Some(ty) => panic!("Unhandled enum type: {}", ty),
                 None if value.starts_with('-') => "EGLint",
                 None if ident == "TRUE" || ident == "FALSE" => "EGLBoolean",
@@ -1036,16 +1036,17 @@ pub fn to_rust_ty<T: AsRef<str>>(ty: T) 
         "NativeWindowType" => "types::NativeWindowType",
         //"Bool"                      => "types::Bool",
         "EGLBoolean" => "types::EGLBoolean",
         "EGLenum" => "types::EGLenum",
         "EGLAttribKHR" => "types::EGLAttribKHR",
         "EGLAttrib" => "types::EGLAttrib",
         "EGLAttrib *" => "*mut types::EGLAttrib",
         "const EGLAttrib *" => "*const types::EGLAttrib",
+        "const EGLattrib *" => "*const types::EGLAttrib", // Due to a typo in khronos_api/api_angle/scripts/egl_angle_ext.xml - see brendanzab/gl-rs#491
         "EGLConfig" => "types::EGLConfig",
         "EGLConfig *" => "*mut types::EGLConfig",
         "EGLContext" => "types::EGLContext",
         "EGLDeviceEXT" => "types::EGLDeviceEXT",
         "EGLDisplay" => "types::EGLDisplay",
         "EGLSurface" => "types::EGLSurface",
         "EGLClientBuffer" => "types::EGLClientBuffer",
         "__eglMustCastToProperFunctionPointerType" => {

--- a/third_party/rust/gleam/.cargo-checksum.json
+++ b/third_party/rust/gleam/.cargo-checksum.json
@@ -1,1 +1,1 @@
-{"files":{"COPYING":"ec82b96487e9e778ee610c7ab245162464782cfa1f555c2299333f8dbe5c036a","Cargo.toml":"40dda1b03ff20d8a3b4b544683f37a8d2b2137cfbb4d545122167352690d6b16","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"62065228e42caebca7e7d7db1204cbb867033de5982ca4009928915e4095f3a3","README.md":"1acb12040be43a3582d5897f11870b3ffdcd7ce0f4f32de158175bb6b33ec0b7","build.rs":"2d3833a24fee9d1f669f4cd7347b4ca8444a138d473ab9188f4d65f6981c4191","rustfmt.toml":"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855","src/gl.rs":"b7791f77dbbea690a7a0d33e3c083337a6b04a233a192dc8c96d4fe481a4a7ed","src/gl_fns.rs":"f88cd940691e0fca169cabbe2a95418300d09392d91a020079cfbdd5bacd753b","src/gles_fns.rs":"3766f2b76aa4038774a4754ce89cdcbb50286ab5bcf07cb0bb6e88f0de31f96f","src/lib.rs":"16610c19b45a3f26d56b379a3591aa2e4fc9477e7bd88f86b31c6ea32e834861"},"package":"7f46fd8874e043ffac0d638ed1567a2584f7814f6d72b4db37ab1689004a26c4"}
\ No newline at end of file
+{"files":{"COPYING":"ec82b96487e9e778ee610c7ab245162464782cfa1f555c2299333f8dbe5c036a","Cargo.toml":"834f409ac81917f5b5730483c90611e3193a8fb7400c87d30e7988d866bc5740","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"62065228e42caebca7e7d7db1204cbb867033de5982ca4009928915e4095f3a3","README.md":"1acb12040be43a3582d5897f11870b3ffdcd7ce0f4f32de158175bb6b33ec0b7","build.rs":"b6b30972ee2be2e151af0ca93b30ccc3c8bce2cfeef4217244d6b413b6bd0c9d","rustfmt.toml":"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855","src/gl.rs":"e923f4ccfeae5112e6cea8f78ff279e8a26c041dcfb5cfb63d9713e733d249c3","src/gl_fns.rs":"67b5eac2a686f4a58201b8d51fc27db1aca6d597dfaa5c8ad4007170ffb18887","src/gles_fns.rs":"1c206adf96e6b9767d526aad54ddfb48e99aa0f5766d3cb72019470f4bdd88f9","src/lib.rs":"16610c19b45a3f26d56b379a3591aa2e4fc9477e7bd88f86b31c6ea32e834861"},"package":"332d1f4e6c6181ed07178f84a552b2387d43ecf6821a86c22cfb3883ea3fb1b9"}
\ No newline at end of file

--- a/third_party/rust/gleam/Cargo.toml
+++ b/third_party/rust/gleam/Cargo.toml
@@ -7,17 +7,17 @@
 #
 # If you believe there's an error in this file please file an
 # issue against the rust-lang/cargo repository. If you're
 # editing this file be aware that the upstream Cargo.toml
 # will likely look very different (and much more reasonable)
 
 [package]
 name = "gleam"
-version = "0.6.17"
+version = "0.9.2"
 authors = ["The Servo Project Developers"]
 build = "build.rs"
 description = "Generated OpenGL bindings and wrapper for Servo."
 documentation = "https://doc.servo.org/gleam/"
 license = "Apache-2.0/MIT"
 repository = "https://github.com/servo/gleam"
 [build-dependencies.gl_generator]
-version = "0.11"
+version = "0.14"

--- a/third_party/rust/gleam/build.rs
+++ b/third_party/rust/gleam/build.rs
@@ -12,16 +12,17 @@ fn main() {
     let mut file_gl = File::create(&Path::new(&dest).join("gl_bindings.rs")).unwrap();
     let mut file_gles = File::create(&Path::new(&dest).join("gles_bindings.rs")).unwrap();
 
     // OpenGL 3.3 bindings
     let gl_extensions = [
         "GL_APPLE_client_storage",
         "GL_APPLE_fence",
         "GL_APPLE_texture_range",
+        "GL_APPLE_vertex_array_object",
         "GL_ARB_blend_func_extended",
         "GL_ARB_copy_image",
         "GL_ARB_get_program_binary",
         "GL_ARB_invalidate_subdata",
         "GL_ARB_texture_rectangle",
         "GL_ARB_texture_storage",
         "GL_EXT_debug_marker",
         "GL_EXT_texture_filter_anisotropic",
@@ -49,16 +50,18 @@ fn main() {
         "GL_EXT_texture_filter_anisotropic",
         "GL_EXT_texture_format_BGRA8888",
         "GL_EXT_texture_storage",
         "GL_OES_EGL_image_external",
         "GL_OES_EGL_image",
         "GL_OES_texture_half_float",
         "GL_EXT_shader_pixel_local_storage",
         "GL_ANGLE_provoking_vertex",
+        "GL_ANGLE_texture_usage",
+        "GL_CHROMIUM_copy_texture",
         "GL_KHR_debug",
         "GL_KHR_blend_equation_advanced",
         "GL_KHR_blend_equation_advanced_coherent",
     ];
     let gles_reg = Registry::new(
         Api::Gles2,
         (3, 0),
         Profile::Core,

--- a/third_party/rust/gleam/src/gl.rs
+++ b/third_party/rust/gleam/src/gl.rs
@@ -18,17 +18,17 @@ use std::str;
 use std::time::{Duration, Instant};
 
 pub use ffi::types::*;
 pub use ffi::*;
 
 pub use ffi_gl::Gl as GlFfi;
 pub use ffi_gles::Gles2 as GlesFfi;
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum GlType {
     Gl,
     Gles,
 }
 
 impl Default for GlType {
     #[cfg(any(target_os = "android", target_os = "ios"))]
     fn default() -> GlType {
@@ -69,42 +69,53 @@ fn calculate_length(width: GLsizei, heig
 pub struct DebugMessage {
     pub message: String,
     pub source: GLenum,
     pub ty: GLenum,
     pub id: GLenum,
     pub severity: GLenum,
 }
 
+mod private {
+    // Private marker trait extended by the Gl public trait so that no one
+    // else outside this crate can implement Gl. Why? So that adding new methods
+    // to it don't lead to a breaking change.
+    pub trait Sealed {}
+}
+use self::private::Sealed;
+
 macro_rules! declare_gl_apis {
     // garbo is a hack to handle unsafe methods.
     ($($(unsafe $([$garbo:expr])*)* fn $name:ident(&self $(, $arg:ident: $t:ty)* $(,)*) $(-> $retty:ty)* ;)+) => {
-        pub trait Gl {
+        pub trait Gl: Sealed {
             $($(unsafe $($garbo)*)* fn $name(&self $(, $arg:$t)*) $(-> $retty)* ;)+
         }
 
+        impl Sealed for ErrorCheckingGl {}
         impl Gl for ErrorCheckingGl {
             $($(unsafe $($garbo)*)* fn $name(&self $(, $arg:$t)*) $(-> $retty)* {
                 let rv = self.gl.$name($($arg,)*);
                 assert_eq!(self.gl.get_error(), 0);
                 rv
             })+
         }
 
-        impl<F: Fn(&Gl, &str, GLenum)> Gl for ErrorReactingGl<F> {
+        impl<F> Sealed for ErrorReactingGl<F> {}
+        impl<F: Fn(&dyn Gl, &str, GLenum)> Gl for ErrorReactingGl<F> {
             $($(unsafe $($garbo)*)* fn $name(&self $(, $arg:$t)*) $(-> $retty)* {
                 let rv = self.gl.$name($($arg,)*);
                 let error = self.gl.get_error();
                 if error != 0 {
                     (self.callback)(&*self.gl, stringify!($name), error);
                 }
                 rv
             })+
         }
 
+        impl<F> Sealed for ProfilingGl<F> {}
         impl<F: Fn(&str, Duration)> Gl for ProfilingGl<F> {
             $($(unsafe $($garbo)*)* fn $name(&self $(, $arg:$t)*) $(-> $retty)* {
                 let start = Instant::now();
                 let rv = self.gl.$name($($arg,)*);
                 let duration = Instant::now() - start;
                 if duration > self.threshold {
                     (self.callback)(stringify!($name), duration);
                 }
@@ -164,26 +175,28 @@ declare_gl_apis! {
     fn sample_coverage(&self, value: GLclampf, invert: bool);
     fn polygon_offset(&self, factor: GLfloat, units: GLfloat);
     fn pixel_store_i(&self, name: GLenum, param: GLint);
     fn gen_buffers(&self, n: GLsizei) -> Vec<GLuint>;
     fn gen_renderbuffers(&self, n: GLsizei) -> Vec<GLuint>;
     fn gen_framebuffers(&self, n: GLsizei) -> Vec<GLuint>;
     fn gen_textures(&self, n: GLsizei) -> Vec<GLuint>;
     fn gen_vertex_arrays(&self, n: GLsizei) -> Vec<GLuint>;
+    fn gen_vertex_arrays_apple(&self, n: GLsizei) -> Vec<GLuint>;
     fn gen_queries(&self, n: GLsizei) -> Vec<GLuint>;
     fn begin_query(&self, target: GLenum, id: GLuint);
     fn end_query(&self, target: GLenum);
     fn query_counter(&self, id: GLuint, target: GLenum);
     fn get_query_object_iv(&self, id: GLuint, pname: GLenum) -> i32;
     fn get_query_object_uiv(&self, id: GLuint, pname: GLenum) -> u32;
     fn get_query_object_i64v(&self, id: GLuint, pname: GLenum) -> i64;
     fn get_query_object_ui64v(&self, id: GLuint, pname: GLenum) -> u64;
     fn delete_queries(&self, queries: &[GLuint]);
     fn delete_vertex_arrays(&self, vertex_arrays: &[GLuint]);
+    fn delete_vertex_arrays_apple(&self, vertex_arrays: &[GLuint]);
     fn delete_buffers(&self, buffers: &[GLuint]);
     fn delete_renderbuffers(&self, renderbuffers: &[GLuint]);
     fn delete_framebuffers(&self, framebuffers: &[GLuint]);
     fn delete_textures(&self, textures: &[GLuint]);
     fn framebuffer_renderbuffer(&self,
                                 target: GLenum,
                                 attachment: GLenum,
                                 renderbuffertarget: GLenum,
@@ -204,16 +217,17 @@ declare_gl_apis! {
     fn bind_buffer_base(&self, target: GLenum, index: GLuint, buffer: GLuint);
     fn bind_buffer_range(&self, target: GLenum, index: GLuint, buffer: GLuint, offset: GLintptr, size: GLsizeiptr);
     fn uniform_block_binding(&self,
                                 program: GLuint,
                                 uniform_block_index: GLuint,
                                 uniform_block_binding: GLuint);
     fn bind_buffer(&self, target: GLenum, buffer: GLuint);
     fn bind_vertex_array(&self, vao: GLuint);
+    fn bind_vertex_array_apple(&self, vao: GLuint);
     fn bind_renderbuffer(&self, target: GLenum, renderbuffer: GLuint);
     fn bind_framebuffer(&self, target: GLenum, framebuffer: GLuint);
     fn bind_texture(&self, target: GLenum, texture: GLuint);
     fn draw_buffers(&self, bufs: &[GLenum]);
     fn tex_image_2d(&self,
                     target: GLenum,
                     level: GLint,
                     internal_format: GLint,
@@ -544,16 +558,17 @@ declare_gl_apis! {
     fn get_error(&self) -> GLenum;
     fn stencil_mask(&self, mask: GLuint);
     fn stencil_mask_separate(&self, face: GLenum, mask: GLuint);
     fn stencil_func(&self, func: GLenum, ref_: GLint, mask: GLuint);
     fn stencil_func_separate(&self, face: GLenum, func: GLenum, ref_: GLint, mask: GLuint);
     fn stencil_op(&self, sfail: GLenum, dpfail: GLenum, dppass: GLenum);
     fn stencil_op_separate(&self, face: GLenum, sfail: GLenum, dpfail: GLenum, dppass: GLenum);
     fn egl_image_target_texture2d_oes(&self, target: GLenum, image: GLeglImageOES);
+    fn egl_image_target_renderbuffer_storage_oes(&self, target: GLenum, image: GLeglImageOES);
     fn generate_mipmap(&self, target: GLenum);
     fn insert_event_marker_ext(&self, message: &str);
     fn push_group_marker_ext(&self, message: &str);
     fn pop_group_marker_ext(&self);
     fn debug_message_insert_khr(&self, source: GLenum, type_: GLenum, id: GLuint, severity: GLenum, message: &str);
     fn push_debug_group_khr(&self, source: GLenum, id: GLuint, message: &str);
     fn pop_debug_group_khr(&self);
     fn fence_sync(&self, condition: GLenum, flags: GLbitfield) -> GLsync;
@@ -583,79 +598,91 @@ declare_gl_apis! {
         &self,
         program: GLuint,
         name: &str,
     ) -> GLint;
 
     // GL_KHR_debug
     fn get_debug_messages(&self) -> Vec<DebugMessage>;
 
-    // GL_ANGLE_provoking_vertex.
+    // GL_ANGLE_provoking_vertex
     fn provoking_vertex_angle(&self, mode: GLenum);
+
+    // GL_CHROMIUM_copy_texture
+    fn copy_texture_chromium(&self,
+        source_id: GLuint, source_level: GLint,
+        dest_target: GLenum, dest_id: GLuint, dest_level: GLint,
+        internal_format: GLint, dest_type: GLenum,
+        unpack_flip_y: GLboolean, unpack_premultiply_alpha: GLboolean, unpack_unmultiply_alpha: GLboolean);
+    fn copy_sub_texture_chromium(&self,
+        source_id: GLuint, source_level: GLint,
+        dest_target: GLenum, dest_id: GLuint, dest_level: GLint,
+        x_offset: GLint, y_offset: GLint, x: GLint, y: GLint, width: GLsizei, height: GLsizei,
+        unpack_flip_y: GLboolean, unpack_premultiply_alpha: GLboolean, unpack_unmultiply_alpha: GLboolean);
 }
 
 //#[deprecated(since = "0.6.11", note = "use ErrorReactingGl instead")]
 pub struct ErrorCheckingGl {
-    gl: Rc<Gl>,
+    gl: Rc<dyn Gl>,
 }
 
 impl ErrorCheckingGl {
-    pub fn wrap(fns: Rc<Gl>) -> Rc<Gl> {
-        Rc::new(ErrorCheckingGl { gl: fns }) as Rc<Gl>
+    pub fn wrap(fns: Rc<dyn Gl>) -> Rc<dyn Gl> {
+        Rc::new(ErrorCheckingGl { gl: fns }) as Rc<dyn Gl>
     }
 }
 
 /// A wrapper around GL context that calls a specified callback on each GL error.
 pub struct ErrorReactingGl<F> {
-    gl: Rc<Gl>,
+    gl: Rc<dyn Gl>,
     callback: F,
 }
 
-impl<F: 'static + Fn(&Gl, &str, GLenum)> ErrorReactingGl<F> {
-    pub fn wrap(fns: Rc<Gl>, callback: F) -> Rc<Gl> {
-        Rc::new(ErrorReactingGl { gl: fns, callback }) as Rc<Gl>
+impl<F: 'static + Fn(&dyn Gl, &str, GLenum)> ErrorReactingGl<F> {
+    pub fn wrap(fns: Rc<dyn Gl>, callback: F) -> Rc<dyn Gl> {
+        Rc::new(ErrorReactingGl { gl: fns, callback }) as Rc<dyn Gl>
     }
 }
 
 /// A wrapper around GL context that times each call and invokes the callback
 /// if the call takes longer than the threshold.
 pub struct ProfilingGl<F> {
-    gl: Rc<Gl>,
+    gl: Rc<dyn Gl>,
     threshold: Duration,
     callback: F,
 }
 
 impl<F: 'static + Fn(&str, Duration)> ProfilingGl<F> {
-    pub fn wrap(fns: Rc<Gl>, threshold: Duration, callback: F) -> Rc<Gl> {
-        Rc::new(ProfilingGl { gl: fns, threshold, callback }) as Rc<Gl>
+    pub fn wrap(fns: Rc<dyn Gl>, threshold: Duration, callback: F) -> Rc<dyn Gl> {
+        Rc::new(ProfilingGl { gl: fns, threshold, callback }) as Rc<dyn Gl>
     }
 }
 
 #[inline]
-pub fn buffer_data<T>(gl_: &Gl, target: GLenum, data: &[T], usage: GLenum) {
+pub fn buffer_data<T>(gl_: &dyn Gl, target: GLenum, data: &[T], usage: GLenum) {
     gl_.buffer_data_untyped(
         target,
         (data.len() * size_of::<T>()) as GLsizeiptr,
         data.as_ptr() as *const GLvoid,
         usage,
     )
 }
 
 #[inline]
-pub fn buffer_data_raw<T>(gl_: &Gl, target: GLenum, data: &T, usage: GLenum) {
+pub fn buffer_data_raw<T>(gl_: &dyn Gl, target: GLenum, data: &T, usage: GLenum) {
     gl_.buffer_data_untyped(
         target,
         size_of::<T>() as GLsizeiptr,
         data as *const T as *const GLvoid,
         usage,
     )
 }
 
 #[inline]
-pub fn buffer_sub_data<T>(gl_: &Gl, target: GLenum, offset: isize, data: &[T]) {
+pub fn buffer_sub_data<T>(gl_: &dyn Gl, target: GLenum, offset: isize, data: &[T]) {
     gl_.buffer_sub_data_untyped(
         target,
         offset,
         (data.len() * size_of::<T>()) as GLsizeiptr,
         data.as_ptr() as *const GLvoid,
     );
 }
 

--- a/third_party/rust/gleam/src/gl_fns.rs
+++ b/third_party/rust/gleam/src/gl_fns.rs
@@ -7,25 +7,26 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
 pub struct GlFns {
     ffi_gl_: GlFfi,
 }
 
 impl GlFns {
-    pub unsafe fn load_with<'a, F>(loadfn: F) -> Rc<Gl>
+    pub unsafe fn load_with<'a, F>(loadfn: F) -> Rc<dyn Gl>
     where
         F: FnMut(&str) -> *const c_void,
     {
         let ffi_gl_ = GlFfi::load_with(loadfn);
-        Rc::new(GlFns { ffi_gl_: ffi_gl_ }) as Rc<Gl>
+        Rc::new(GlFns { ffi_gl_: ffi_gl_ }) as Rc<dyn Gl>
     }
 }
 
+impl Sealed for GlFns {}
 impl Gl for GlFns {
     fn get_type(&self) -> GlType {
         GlType::Gl
     }
 
     fn buffer_data_untyped(
         &self,
         target: GLenum,
@@ -216,17 +217,25 @@ impl Gl for GlFns {
             self.ffi_gl_.GenTextures(n, result.as_mut_ptr());
         }
         result
     }
 
     fn gen_vertex_arrays(&self, n: GLsizei) -> Vec<GLuint> {
         let mut result = vec![0 as GLuint; n as usize];
         unsafe {
-            self.ffi_gl_.GenVertexArrays(n, result.as_mut_ptr());
+            self.ffi_gl_.GenVertexArrays(n, result.as_mut_ptr())
+        }
+        result
+    }
+
+    fn gen_vertex_arrays_apple(&self, n: GLsizei) -> Vec<GLuint> {
+        let mut result = vec![0 as GLuint; n as usize];
+        unsafe {
+            self.ffi_gl_.GenVertexArraysAPPLE(n, result.as_mut_ptr())
         }
         result
     }
 
     fn gen_queries(&self, n: GLsizei) -> Vec<GLuint> {
         let mut result = vec![0 as GLuint; n as usize];
         unsafe {
             self.ffi_gl_.GenQueries(n, result.as_mut_ptr());
@@ -293,16 +302,23 @@ impl Gl for GlFns {
 
     fn delete_vertex_arrays(&self, vertex_arrays: &[GLuint]) {
         unsafe {
             self.ffi_gl_
                 .DeleteVertexArrays(vertex_arrays.len() as GLsizei, vertex_arrays.as_ptr());
         }
     }
 
+    fn delete_vertex_arrays_apple(&self, vertex_arrays: &[GLuint]) {
+        unsafe {
+            self.ffi_gl_
+                .DeleteVertexArraysAPPLE(vertex_arrays.len() as GLsizei, vertex_arrays.as_ptr());
+        }
+    }
+
     fn delete_buffers(&self, buffers: &[GLuint]) {
         unsafe {
             self.ffi_gl_
                 .DeleteBuffers(buffers.len() as GLsizei, buffers.as_ptr());
         }
     }
 
     fn delete_renderbuffers(&self, renderbuffers: &[GLuint]) {
@@ -459,16 +475,22 @@ impl Gl for GlFns {
     }
 
     fn bind_vertex_array(&self, vao: GLuint) {
         unsafe {
             self.ffi_gl_.BindVertexArray(vao);
         }
     }
 
+    fn bind_vertex_array_apple(&self, vao: GLuint) {
+        unsafe {
+            self.ffi_gl_.BindVertexArrayAPPLE(vao)
+        }
+    }
+
     fn bind_renderbuffer(&self, target: GLenum, renderbuffer: GLuint) {
         unsafe {
             self.ffi_gl_.BindRenderbuffer(target, renderbuffer);
         }
     }
 
     fn bind_framebuffer(&self, target: GLenum, framebuffer: GLuint) {
         unsafe {
@@ -1911,16 +1933,21 @@ impl Gl for GlFns {
         unsafe { self.ffi_gl_.StencilOpSeparate(face, sfail, dpfail, dppass) }
     }
 
     #[allow(unused_variables)]
     fn egl_image_target_texture2d_oes(&self, target: GLenum, image: GLeglImageOES) {
         panic!("not supported")
     }
 
+    #[allow(unused_variables)]
+    fn egl_image_target_renderbuffer_storage_oes(&self, target: GLenum, image: GLeglImageOES) {
+        panic!("not supported")
+    }
+
     fn generate_mipmap(&self, target: GLenum) {
         unsafe { self.ffi_gl_.GenerateMipmap(target) }
     }
 
     fn insert_event_marker_ext(&self, message: &str) {
         if self.ffi_gl_.InsertEventMarkerEXT.is_loaded() {
             unsafe {
                 self.ffi_gl_
@@ -2148,9 +2175,27 @@ impl Gl for GlFns {
     // GL_KHR_blend_equation_advanced
     fn blend_barrier_khr(&self) {
         if self.ffi_gl_.BlendBarrierKHR.is_loaded() {
             unsafe {
                 self.ffi_gl_.BlendBarrierKHR();
             }
         }
     }
+
+    // GL_CHROMIUM_copy_texture
+    fn copy_texture_chromium(&self,
+        _source_id: GLuint, _source_level: GLint,
+        _dest_target: GLenum, _dest_id: GLuint, _dest_level: GLint,
+        _internal_format: GLint, _dest_type: GLenum,
+        _unpack_flip_y: GLboolean, _unpack_premultiply_alpha: GLboolean, _unpack_unmultiply_alpha: GLboolean)
+    {
+        unimplemented!("This extension is GLES only");
+    }
+    fn copy_sub_texture_chromium(&self,
+        _source_id: GLuint, _source_level: GLint,
+        _dest_target: GLenum, _dest_id: GLuint, _dest_level: GLint,
+        _x_offset: GLint, _y_offset: GLint, _x: GLint, _y: GLint, _width: GLsizei, _height: GLsizei,
+        _unpack_flip_y: GLboolean, _unpack_premultiply_alpha: GLboolean, _unpack_unmultiply_alpha: GLboolean)
+    {
+        unimplemented!("This extension is GLES only");
+    }
 }

--- a/third_party/rust/gleam/src/gles_fns.rs
+++ b/third_party/rust/gleam/src/gles_fns.rs
@@ -7,25 +7,26 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
 pub struct GlesFns {
     ffi_gl_: GlesFfi,
 }
 
 impl GlesFns {
-    pub unsafe fn load_with<'a, F>(loadfn: F) -> Rc<Gl>
+    pub unsafe fn load_with<'a, F>(loadfn: F) -> Rc<dyn Gl>
     where
         F: FnMut(&str) -> *const c_void,
     {
         let ffi_gl_ = GlesFfi::load_with(loadfn);
-        Rc::new(GlesFns { ffi_gl_: ffi_gl_ }) as Rc<Gl>
+        Rc::new(GlesFns { ffi_gl_: ffi_gl_ }) as Rc<dyn Gl>
     }
 }
 
+impl Sealed for GlesFns {}
 impl Gl for GlesFns {
     fn get_type(&self) -> GlType {
         GlType::Gles
     }
 
     fn buffer_data_untyped(
         &self,
         target: GLenum,
@@ -216,16 +217,20 @@ impl Gl for GlesFns {
     fn gen_vertex_arrays(&self, n: GLsizei) -> Vec<GLuint> {
         let mut result = vec![0 as GLuint; n as usize];
         unsafe {
             self.ffi_gl_.GenVertexArrays(n, result.as_mut_ptr());
         }
         result
     }
 
+    fn gen_vertex_arrays_apple(&self, _n: GLsizei) -> Vec<GLuint> {
+        panic!("not supported")
+    }
+
     fn gen_queries(&self, n: GLsizei) -> Vec<GLuint> {
         if !self.ffi_gl_.GenQueriesEXT.is_loaded() {
             return Vec::new();
         }
         let mut result = vec![0 as GLuint; n as usize];
         unsafe {
             self.ffi_gl_.GenQueriesEXT(n, result.as_mut_ptr());
         }
@@ -315,16 +320,20 @@ impl Gl for GlesFns {
 
     fn delete_vertex_arrays(&self, vertex_arrays: &[GLuint]) {
         unsafe {
             self.ffi_gl_
                 .DeleteVertexArrays(vertex_arrays.len() as GLsizei, vertex_arrays.as_ptr());
         }
     }
 
+    fn delete_vertex_arrays_apple(&self, _vertex_arrays: &[GLuint]) {
+        panic!("not supported")
+    }
+
     fn delete_buffers(&self, buffers: &[GLuint]) {
         unsafe {
             self.ffi_gl_
                 .DeleteBuffers(buffers.len() as GLsizei, buffers.as_ptr());
         }
     }
 
     fn delete_renderbuffers(&self, renderbuffers: &[GLuint]) {
@@ -481,16 +490,20 @@ impl Gl for GlesFns {
     }
 
     fn bind_vertex_array(&self, vao: GLuint) {
         unsafe {
             self.ffi_gl_.BindVertexArray(vao);
         }
     }
 
+    fn bind_vertex_array_apple(&self, _vao: GLuint) {
+        panic!("not supported")
+    }
+
     fn bind_renderbuffer(&self, target: GLenum, renderbuffer: GLuint) {
         unsafe {
             self.ffi_gl_.BindRenderbuffer(target, renderbuffer);
         }
     }
 
     fn bind_framebuffer(&self, target: GLenum, framebuffer: GLuint) {
         unsafe {
@@ -1917,16 +1930,22 @@ impl Gl for GlesFns {
     }
 
     fn egl_image_target_texture2d_oes(&self, target: GLenum, image: GLeglImageOES) {
         unsafe {
             self.ffi_gl_.EGLImageTargetTexture2DOES(target, image);
         }
     }
 
+    fn egl_image_target_renderbuffer_storage_oes(&self, target: GLenum, image: GLeglImageOES) {
+        unsafe {
+            self.ffi_gl_.EGLImageTargetRenderbufferStorageOES(target, image);
+        }
+    }
+
     fn generate_mipmap(&self, target: GLenum) {
         unsafe { self.ffi_gl_.GenerateMipmap(target) }
     }
 
     fn insert_event_marker_ext(&self, message: &str) {
         if self.ffi_gl_.InsertEventMarkerEXT.is_loaded() {
             unsafe {
                 self.ffi_gl_
@@ -2115,9 +2134,37 @@ impl Gl for GlesFns {
     // GL_KHR_blend_equation_advanced
     fn blend_barrier_khr(&self) {
         if self.ffi_gl_.BlendBarrierKHR.is_loaded() {
             unsafe {
                 self.ffi_gl_.BlendBarrierKHR();
             }
         }
     }
+
+    // GL_CHROMIUM_copy_texture
+    fn copy_texture_chromium(&self,
+        source_id: GLuint, source_level: GLint,
+        dest_target: GLenum, dest_id: GLuint, dest_level: GLint,
+        internal_format: GLint, dest_type: GLenum,
+        unpack_flip_y: GLboolean, unpack_premultiply_alpha: GLboolean, unpack_unmultiply_alpha: GLboolean)
+    {
+        unsafe {
+            self.ffi_gl_.CopyTextureCHROMIUM(source_id, source_level, dest_target, dest_id, dest_level,
+                internal_format, dest_type,
+                unpack_flip_y, unpack_premultiply_alpha, unpack_unmultiply_alpha,
+            );
+        }
+    }
+    fn copy_sub_texture_chromium(&self,
+        source_id: GLuint, source_level: GLint,
+        dest_target: GLenum, dest_id: GLuint, dest_level: GLint,
+        x_offset: GLint, y_offset: GLint, x: GLint, y: GLint, width: GLsizei, height: GLsizei,
+        unpack_flip_y: GLboolean, unpack_premultiply_alpha: GLboolean, unpack_unmultiply_alpha: GLboolean)
+    {
+        unsafe {
+            self.ffi_gl_.CopySubTextureCHROMIUM(source_id, source_level, dest_target, dest_id, dest_level,
+                x_offset, y_offset, x, y, width, height,
+                unpack_flip_y, unpack_premultiply_alpha, unpack_unmultiply_alpha,
+            );
+        }
+    }
 }