Remove backface visibility

sky/engine/public/platform/WebLayer.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 76 matching lines @@
     virtual bool drawsContent() const = 0;
 
     // Sets whether the layer's transform should be flattened.
     virtual void setShouldFlattenTransform(bool) = 0;
 
     // Sets the id of the layer's 3d rendering context. Layers in the same 3d
     // rendering context id are sorted with one another according to their 3d
     // position rather than their tree order.
     virtual void setRenderingContext(int id) = 0;
 
-    // Mark that this layer should use its parent's transform and double-sided
-    // properties in determining this layer's backface visibility instead of
-    // using its own properties. If this property is set, this layer must
-    // have a parent, and the parent may not have this property set.
-    // Note: This API is to work around issues with visibility the handling of
-    // WebKit layers that have a contents layer (canvas, plugin, WebGL, video,
-    // etc).
-    virtual void setUseParentBackfaceVisibility(bool) = 0;
-
     virtual void setBackgroundColor(WebColor) = 0;
     virtual WebColor backgroundColor() const = 0;
 
     // Removes all animations with the given id.
     virtual void removeAnimation(int animationId) = 0;
 
     // Pauses all animations with the given id.
     virtual void pauseAnimation(int animationId, double timeOffset) = 0;
 
     // Returns true if this layer has any active animations - useful for tests.
@@ skipping 27 matching lines @@
     // so, but this is to facilitate benchmarks and tests.
     virtual void setForceRenderSurface(bool) = 0;
 
     // True if the layer is not part of a tree attached to a WebLayerTreeView.
     virtual bool isOrphan() const = 0;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBLAYER_H_