Slimming Paint phase 2 compositing algorithm plumbing & skeleton display list API.

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 12 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebLayer_h
 #define WebLayer_h
 
 #include "WebBlendMode.h"
 #include "WebColor.h"
 #include "WebCommon.h"
 #include "WebCompositorAnimation.h"
+#include "WebDisplayItemTransformTree.h"
+#include "WebDisplayList.h"
 #include "WebDoublePoint.h"
 #include "WebFloatPoint3D.h"
 #include "WebPoint.h"
 #include "WebRect.h"
 #include "WebScrollBlocksOn.h"
 #include "WebSize.h"
 #include "WebString.h"
 #include "WebVector.h"
 
 class SkMatrix44;
@@ skipping 181 matching lines @@
     virtual void setScrollClient(WebLayerScrollClient*) = 0;
 
     // Forces this layer to use a render surface. There is no benefit in doing
     // 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;
 
     virtual void setWebLayerClient(WebLayerClient*) = 0;
+
+    virtual const WebDisplayList* displayList() { return 0; };
+
+    // This is only set on a root graphics layer.
+    virtual const WebDisplayItemTransformTree* transformTree() { return 0; };
 };
 
 } // namespace blink
 
 #endif // WebLayer_h