Implement SkImageFilter support in the compositor.

cc/damage_tracker.cc

Index: cc/damage_tracker.cc
diff --git a/cc/damage_tracker.cc b/cc/damage_tracker.cc
index b907e3e5edeec06dd112ac237b0809e6f5052e62..1dc16f5e65ad3ab99d1a1e7a602ba30e06724715 100644
--- a/cc/damage_tracker.cc
+++ b/cc/damage_tracker.cc
@@ -51,7 +51,7 @@ static inline void expandDamageRectInsideRectWithFilters(FloatRect& damageRect,
     damageRect.unite(expandedDamageRect);
 }
 
-void CCDamageTracker::updateDamageTrackingState(const std::vector<CCLayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const IntRect& targetSurfaceContentRect, CCLayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations& filters)
+void CCDamageTracker::updateDamageTrackingState(const std::vector<CCLayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const IntRect& targetSurfaceContentRect, CCLayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations& filters, SkImageFilter* filter)
 {
     //
     // This function computes the "damage rect" of a target surface, and updates the state
@@ -136,6 +136,10 @@ void CCDamageTracker::updateDamageTrackingState(const std::vector<CCLayerImpl*>&
 
         if (filters.hasFilterThatMovesPixels())
             expandRectWithFilters(damageRectForThisUpdate, filters);
+        else if (filter)

[danakj, 2012/10/22 18:00:43]

nit: add braces {}

[Stephen White, 2012/10/22 18:51:00]

Done.

+            // TODO(senorblanco):  Once SkImageFilter reports its outsets, use
+            // those here to limit damage.
+            damageRectForThisUpdate = targetSurfaceContentRect;
     }
 
     // Damage accumulates until we are notified that we actually did draw on that frame.