blink: Add backdrop-filter support

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 110 matching lines @@
     // etc).
     virtual void setUseParentBackfaceVisibility(bool) = 0;
 
     virtual void setBackgroundColor(WebColor) = 0;
     virtual WebColor backgroundColor() const = 0;
 
     // Clear the filters in use by passing in a newly instantiated
     // WebFilterOperations object.
     virtual void setFilters(const WebFilterOperations&) = 0;
 
+    // Clear the background filters in use by passing in a newly instantiated
+    // WebFilterOperations object.
+    virtual void setBackgroundFilters(const WebFilterOperations&) = 0;
+
     // An animation delegate is notified when animations are started and
     // stopped. The WebLayer does not take ownership of the delegate, and it is
     // the responsibility of the client to reset the layer's delegate before
     // deleting the delegate.
     virtual void setAnimationDelegate(WebCompositorAnimationDelegate*) = 0;
 
 
     // Returns false if the animation cannot be added.
     // Takes ownership of the WebCompositorAnimation object.
     virtual bool addAnimation(WebCompositorAnimation*) = 0;
@@ skipping 88 matching lines @@
 
     // True if the layer is not part of a tree attached to a WebLayerTreeView.
     virtual bool isOrphan() const = 0;
 
     virtual void setWebLayerClient(WebLayerClient*) = 0;
 };
 
 } // namespace blink
 
 #endif // WebLayer_h