cc : Delete LayerImpl::opacity

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index f0b482cc5cbffdb7754d55fbeabb356bb809b6a4..a5f41f98075e5e24902f421c2dca1adb0eb6288b 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -147,7 +147,7 @@ class CC_EXPORT LayerImpl {
 
   void UpdatePropertyTreeTransform();
   void UpdatePropertyTreeTransformIsAnimated(bool is_animated);
-  void UpdatePropertyTreeOpacity();
+  void UpdatePropertyTreeOpacity(float opacity);
   void UpdatePropertyTreeScrollOffset();
 
   // For compatibility with Layer.
@@ -239,8 +239,7 @@ class CC_EXPORT LayerImpl {
   void SetContentsOpaque(bool opaque);
   bool contents_opaque() const { return contents_opaque_; }
 
-  void SetOpacity(float opacity);
-  float opacity() const { return opacity_; }
+  float Opacity() const;
   bool OpacityIsAnimating() const;
   bool HasPotentiallyRunningOpacityAnimation() const;
 
@@ -600,7 +599,6 @@ class CC_EXPORT LayerImpl {
   SkColor background_color_;
   SkColor safe_opaque_background_color_;
 
-  float opacity_;
   SkXfermode::Mode blend_mode_;
   // draw_blend_mode may be different than blend_mode_,
   // when a RenderSurface re-parents the layer's blend_mode.