Avoid exposing cc::Layer tree to CompositorProxy

third_party/WebKit/Source/platform/graphics/CompositorMutableState.h

Index: third_party/WebKit/Source/platform/graphics/CompositorMutableState.h
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorMutableState.h b/third_party/WebKit/Source/platform/graphics/CompositorMutableState.h
index 4922aee537ec9ac6023917f533f6fdd2db247ee8..f616a916e0dda1a3c2bdc66984400bbe8178f0fc 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositorMutableState.h
+++ b/third_party/WebKit/Source/platform/graphics/CompositorMutableState.h
@@ -9,20 +9,15 @@
 
 class SkMatrix44;
 
-namespace cc {
-class LayerImpl;
-}  // namespace cc
-
 namespace blink {
 
+class CompositorMutableProperties;
 class CompositorMutation;
 
 // This class wraps the compositor-owned, mutable state for a single element.
 class PLATFORM_EXPORT CompositorMutableState {
  public:
-  CompositorMutableState(CompositorMutation*,
-                         cc::LayerImpl* main,
-                         cc::LayerImpl* scroll);
+  CompositorMutableState(CompositorMutation*, CompositorMutableProperties*);
   ~CompositorMutableState();
 
   double opacity() const;
@@ -39,8 +34,7 @@ class PLATFORM_EXPORT CompositorMutableState {
 
  private:
   CompositorMutation* m_mutation;
-  cc::LayerImpl* m_mainLayer;
-  cc::LayerImpl* m_scrollLayer;
+  CompositorMutableProperties* m_properties;
 };
 
 }  // namespace blink