Implement SkImageFilter support in the compositor.

cc/damage_tracker.h

Index: cc/damage_tracker.h
diff --git a/cc/damage_tracker.h b/cc/damage_tracker.h
index 5121b064e8d28219798b8ef1e02a8d8b8e4f10c6..576d0f26efdbc0cbe9aac41d751f0bb59eb33902 100644
--- a/cc/damage_tracker.h
+++ b/cc/damage_tracker.h
@@ -14,6 +14,8 @@ namespace WebKit {
 class WebFilterOperations;
 }
 
+class SkImageFilter;
+
 namespace cc {
 
 class CCLayerImpl;
@@ -28,7 +30,7 @@ public:
 
     void didDrawDamagedArea() { m_currentDamageRect = FloatRect(); }
     void forceFullDamageNextUpdate() { m_forceFullDamageNextUpdate = true; }
-    void updateDamageTrackingState(const std::vector<CCLayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const IntRect& targetSurfaceContentRect, CCLayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations&);
+    void updateDamageTrackingState(const std::vector<CCLayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const IntRect& targetSurfaceContentRect, CCLayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations&, SkImageFilter* filter);
 
     const FloatRect& currentDamageRect() { return m_currentDamageRect; }