--- a/gfx/gl/GLContext.cpp
+++ b/gfx/gl/GLContext.cpp
@@ -589,16 +589,17 @@ GLContext::InitWithPrefixImpl(const char
             // Other parts of Gecko should avoid using these
             { (PRFuncPtr*) &mSymbols.fDrawBuffers, { "DrawBuffers", nullptr } },
             { (PRFuncPtr*) &mSymbols.fClientActiveTexture, { "ClientActiveTexture", nullptr } },
             { (PRFuncPtr*) &mSymbols.fDisableClientState, { "DisableClientState", nullptr } },
             { (PRFuncPtr*) &mSymbols.fEnableClientState, { "EnableClientState", nullptr } },
             { (PRFuncPtr*) &mSymbols.fLoadIdentity, { "LoadIdentity", nullptr } },
             { (PRFuncPtr*) &mSymbols.fLoadMatrixf, { "LoadMatrixf", nullptr } },
             { (PRFuncPtr*) &mSymbols.fMatrixMode, { "MatrixMode", nullptr } },
+            { (PRFuncPtr*) &mSymbols.fPolygonMode, { "PolygonMode", nullptr } },
             { (PRFuncPtr*) &mSymbols.fTexGeni, { "TexGeni", nullptr } },
             { (PRFuncPtr*) &mSymbols.fTexGenf, { "TexGenf", nullptr } },
             { (PRFuncPtr*) &mSymbols.fTexGenfv, { "TexGenfv", nullptr } },
             { (PRFuncPtr*) &mSymbols.fVertexPointer, { "VertexPointer", nullptr } },
             END_SYMBOLS
         };
 
         if (!LoadGLSymbols(this, prefix, trygl, symbols, "Desktop OpenGL"))

--- a/gfx/gl/GLContext.h
+++ b/gfx/gl/GLContext.h
@@ -1454,16 +1454,22 @@ public:
     }
 
     void fPointParameterf(GLenum pname, GLfloat param) {
         BEFORE_GL_CALL;
         mSymbols.fPointParameterf(pname, param);
         AFTER_GL_CALL;
     }
 
+    void fPolygonMode(GLenum face, GLenum mode) {
+        BEFORE_GL_CALL;
+        mSymbols.fPolygonMode(face, mode);
+        AFTER_GL_CALL;
+    }
+
     void fPolygonOffset(GLfloat factor, GLfloat bias) {
         BEFORE_GL_CALL;
         mSymbols.fPolygonOffset(factor, bias);
         AFTER_GL_CALL;
     }
 
     void fPopDebugGroup() {
         BEFORE_GL_CALL;

--- a/gfx/gl/GLContextSymbols.h
+++ b/gfx/gl/GLContextSymbols.h
@@ -198,16 +198,18 @@ struct GLContextSymbols
     typedef void (GLAPIENTRY * PFNGLLINEWIDTHPROC) (GLfloat width);
     PFNGLLINEWIDTHPROC fLineWidth;
     typedef void (GLAPIENTRY * PFNGLLINKPROGRAMPROC) (GLuint program);
     PFNGLLINKPROGRAMPROC fLinkProgram;
     typedef void (GLAPIENTRY * PFNGLPIXELSTOREIPROC) (GLenum pname, GLint param);
     PFNGLPIXELSTOREIPROC fPixelStorei;
     typedef void (GLAPIENTRY * PFNGLPOINTPARAMETERFPROC) (GLenum pname, GLfloat param);
     PFNGLPOINTPARAMETERFPROC fPointParameterf;
+    typedef void (GLAPIENTRY * PFNGLPOLYGONMODEPROC) (GLenum face, GLenum mode);
+    PFNGLPOLYGONMODEPROC fPolygonMode;
     typedef void (GLAPIENTRY * PFNGLPOLYGONOFFSETPROC) (GLfloat factor, GLfloat bias);
     PFNGLPOLYGONOFFSETPROC fPolygonOffset;
     typedef void (GLAPIENTRY * PFNGLREADBUFFERPROC) (GLenum);
     PFNGLREADBUFFERPROC fReadBuffer;
     typedef void (GLAPIENTRY * PFNGLREADPIXELSPROC) (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels);
     PFNGLREADPIXELSPROC fReadPixels;
     typedef void (GLAPIENTRY * PFNGLSAMPLECOVERAGEPROC) (GLclampf value, realGLboolean invert);
     PFNGLSAMPLECOVERAGEPROC fSampleCoverage;

--- a/gfx/gl/SkiaGLGlue.cpp
+++ b/gfx/gl/SkiaGLGlue.cpp
@@ -216,16 +216,17 @@ static GrGLInterface* CreateGrGLInterfac
     i->fFunctions.fGetShaderInfoLog = WrapGL(context, &GLContext::fGetShaderInfoLog);
     i->fFunctions.fGetShaderiv = WrapGL(context, &GLContext::fGetShaderiv);
     i->fFunctions.fGetShaderPrecisionFormat = WrapGL(context, &GLContext::fGetShaderPrecisionFormat);
     i->fFunctions.fGetString = getString;
     i->fFunctions.fGetUniformLocation = WrapGL(context, &GLContext::fGetUniformLocation);
     i->fFunctions.fLineWidth = WrapGL(context, &GLContext::fLineWidth);
     i->fFunctions.fLinkProgram = WrapGL(context, &GLContext::fLinkProgram);
     i->fFunctions.fPixelStorei = WrapGL(context, &GLContext::fPixelStorei);
+    i->fFunctions.fPolygonMode = WrapGL(context, &GLContext::fPolygonMode);
     i->fFunctions.fReadPixels = WrapGL(context, &GLContext::fReadPixels);
     i->fFunctions.fRenderbufferStorage = WrapGL(context, &GLContext::fRenderbufferStorage);
     i->fFunctions.fScissor = WrapGL(context, &GLContext::fScissor);
     i->fFunctions.fShaderSource = WrapGL(context, &GLContext::fShaderSource);
     i->fFunctions.fStencilFunc = WrapGL(context, &GLContext::fStencilFunc);
     i->fFunctions.fStencilMask = WrapGL(context, &GLContext::fStencilMask);
     i->fFunctions.fStencilOp = WrapGL(context, &GLContext::fStencilOp);
     i->fFunctions.fTexImage2D = WrapGL(context, &GLContext::fTexImage2D);