Changes subtreeShouldRenderToSeparateSurface logic to account for explicit clipping

cc/layer.h

Index: cc/layer.h
diff --git a/cc/layer.h b/cc/layer.h
index 2be73c220a07f1db8c00243d3a95d9d446faa5cf..af2ac3ff58c1c5c402edbbe1a5bf21e47e9fb334 100644
--- a/cc/layer.h
+++ b/cc/layer.h
@@ -282,6 +282,8 @@ public:
     // canvas that doesn't want to be triple-buffered across all three trees.
     virtual bool blocksPendingCommit() const;
 
+    virtual bool canClipSelf() const { return false; }

[danakj, 2012/12/15 18:49:12]

Even if this is meant to be short lived, we should not leave the code in a weird
state. This name should be the accessor for m_drawProps.can_clip_self, and a
different named thing should be the virtual method here.

+
 protected:
     friend class LayerImpl;
     friend class TreeSynchronizer;