Add CCDelegatingRenderer, and corresponding IPCs

cc/CCOcclusionTracker.h

Index: cc/CCOcclusionTracker.h
diff --git a/cc/CCOcclusionTracker.h b/cc/CCOcclusionTracker.h
index c2526cdc38eb04639c92ab76a344a2d4b60137e4..e93350b01c6bcc6d4f7ea8ac09824f3526270eb2 100644
--- a/cc/CCOcclusionTracker.h
+++ b/cc/CCOcclusionTracker.h
@@ -35,7 +35,7 @@ public:
     // Returns true if the given rect in content space for the layer is fully occluded in either screen space or the layer's target surface.
     bool occluded(const LayerType*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface = 0) const;
     // Gives an unoccluded sub-rect of |contentRect| in the content space of the layer. Used when considering occlusion for a layer that paints/draws something.
-    IntRect unoccludedContentRect(const LayerType*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface = 0) const;
+    IntRect unoccludedContentRect(const LayerType*, const IntRect& contentRect, const WebKit::WebTransformationMatrix& drawTransform, bool transformsToTargetKnown, const IntRect& clipRectInTarget, bool* hasOcclusionFromOutsideTargetSurface = 0) const;
 
     // Gives an unoccluded sub-rect of |contentRect| in the content space of the renderTarget owned by the layer.
     // Used when considering occlusion for a contributing surface that is rendering into another target.