--- a/gfx/layers/wr/WebRenderDisplayItemLayer.cpp
+++ b/gfx/layers/wr/WebRenderDisplayItemLayer.cpp
@@ -35,17 +35,18 @@ WebRenderDisplayItemLayer::RenderLayer(w
 {
   if (mVisibleRegion.IsEmpty()) {
     return;
   }
 
   Maybe<WrImageMask> mask = BuildWrMaskLayer(false);
   WrImageMask* imageMask = mask.ptrOr(nullptr);
   if (imageMask) {
-    gfx::Rect rect = TransformedVisibleBoundsRelativeToParent();
+    gfx::Rect rect = GetTransform().TransformBounds(Bounds().ToUnknownRect());
+    // XXX: this is probably not correct, see bug 1361357
     gfx::Rect clip(0.0, 0.0, rect.width, rect.height);
     aBuilder.PushClip(wr::ToWrRect(clip), imageMask);
   }
 
   if (mItem) {
     wr::DisplayListBuilder builder(WrBridge()->GetPipeline());
     // We might have recycled this layer. Throw away the old commands.
     mParentCommands.Clear();

--- a/gfx/layers/wr/WebRenderLayer.cpp
+++ b/gfx/layers/wr/WebRenderLayer.cpp
@@ -35,35 +35,16 @@ WrImageKey
 WebRenderLayer::GetImageKey()
 {
   WrImageKey key;
   key.mNamespace = WrBridge()->GetNamespace();
   key.mHandle = WrBridge()->GetNextResourceId();
   return key;
 }
 
-LayerRect
-WebRenderLayer::ParentBounds()
-{
-  // Walk up to find the parent stacking context. This will be created by the
-  // parent layer which must be a ContainerLayer if it exists.
-  if (Layer* parent = GetLayer()->GetParent()) {
-    return ToWebRenderLayer(parent)->Bounds();
-  }
-  return LayerRect();
-}
-
-gfx::Rect
-WebRenderLayer::TransformedVisibleBoundsRelativeToParent()
-{
-  IntRect bounds = GetLayer()->GetVisibleRegion().GetBounds().ToUnknownRect();
-  Rect transformed = GetLayer()->GetTransform().TransformBounds(IntRectToRect(bounds));
-  return transformed - ParentBounds().ToUnknownRect().TopLeft();
-}
-
 Maybe<WrImageMask>
 WebRenderLayer::BuildWrMaskLayer(bool aUnapplyLayerTransform)
 {
   if (GetLayer()->GetMaskLayer()) {
     WebRenderLayer* maskLayer = ToWebRenderLayer(GetLayer()->GetMaskLayer());
 
     // The size of mask layer is transformed, and we may set the layer transform
     // to wr stacking context. So we should apply inverse transform for mask layer

--- a/gfx/layers/wr/WebRenderLayer.h
+++ b/gfx/layers/wr/WebRenderLayer.h
@@ -47,21 +47,18 @@ public:
   WebRenderLayerManager* WrManager();
   WebRenderBridgeChild* WrBridge();
   WrImageKey GetImageKey();
 
   LayerRect Bounds();
   LayerRect BoundsForStackingContext();
 protected:
   BoundsTransformMatrix BoundsTransform();
-  LayerRect ParentBounds();
   Maybe<LayerRect> ClipRect();
 
-  gfx::Rect TransformedVisibleBoundsRelativeToParent();
-
   void DumpLayerInfo(const char* aLayerType, const LayerRect& aRect);
   Maybe<WrImageMask> BuildWrMaskLayer(bool aUnapplyLayerTransform);
 };
 
 } // namespace layers
 } // namespace mozilla
 
 #endif /* GFX_WEBRENDERLAYER_H */