Remove masks_to_bounds from GraphicsLayer

This is no longer used in layer list mode.

In layer list mode, cc::Layer's masks_to_bounds is only used in
Layer::SetBounds to call SetSubtreePropertyChanged, but this will
already be called when the associated clip changes.

Bug: 993936
Change-Id: I1d32a5d15b847588a4a6855871b680caea0cfbed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956542
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722777}

cc/layers/layer.cc

@@ -515,6 +515,7 @@ SkColor Layer::SafeOpaqueBackgroundColor() const {
 
 void Layer::SetMasksToBounds(bool masks_to_bounds) {
   DCHECK(IsPropertyChangeAllowed());
+  DCHECK(!layer_tree_host_ || !layer_tree_host_->IsUsingLayerLists());
   if (inputs_.masks_to_bounds == masks_to_bounds)
     return;
   inputs_.masks_to_bounds = masks_to_bounds;

third_party/blink/renderer/core/paint/compositing/composited_layer_mapping.cc

@@ -850,7 +850,6 @@ void CompositedLayerMapping::UpdateOverflowControlsHostLayerGeometry(
       owning_layer_.GetLayoutBox()->PixelSnappedBorderBoxRect(
           owning_layer_.SubpixelAccumulation());
   overflow_controls_host_layer_->SetSize(gfx::Size(border_box.Size()));
-  overflow_controls_host_layer_->SetMasksToBounds(true);
 }
 
 void CompositedLayerMapping::UpdateMaskLayerGeometry() {
@@ -1393,7 +1392,6 @@ bool CompositedLayerMapping::UpdateScrollingLayers(
           CreateGraphicsLayer(CompositingReason::kLayerForScrollingContainer);
       scrolling_layer_->SetDrawsContent(false);
       scrolling_layer_->SetHitTestable(false);
-      scrolling_layer_->SetMasksToBounds(true);
 
       // Inner layer which renders the content that scrolls.
       scrolling_contents_layer_ =

third_party/blink/renderer/platform/graphics/graphics_layer.cc

@@ -600,15 +600,6 @@ void GraphicsLayer::SetSize(const gfx::Size& size) {
   // Note that we don't resize m_contentsLayer. It's up the caller to do that.
 }
 
-
-bool GraphicsLayer::MasksToBounds() const {
-  return CcLayer()->masks_to_bounds();
-}
-
-void GraphicsLayer::SetMasksToBounds(bool masks_to_bounds) {
-  CcLayer()->SetMasksToBounds(masks_to_bounds);
-}
-
 void GraphicsLayer::SetDrawsContent(bool draws_content) {
   // NOTE: This early-exit is only correct because we also properly call
   // cc::Layer::SetIsDrawable() whenever |contents_layer_| is set to a new

third_party/blink/renderer/platform/graphics/graphics_layer.h

@@ -127,9 +127,6 @@ class PLATFORM_EXPORT GraphicsLayer : public DisplayItemClient,
 
   void SetRenderingContext(int id);
 
-  bool MasksToBounds() const;
-  void SetMasksToBounds(bool);
-
   bool DrawsContent() const { return draws_content_; }
   void SetDrawsContent(bool);