Changes subtreeShouldRenderToSeparateSurface logic to account for explicit clipping

cc/layer.h

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYER_H_
 #define CC_LAYER_H_
 
 #include <public/WebFilterOperations.h>
 #include <string>
 #include <vector>
@@ skipping 264 matching lines @@
 
     virtual ScrollbarLayer* toScrollbarLayer();
 
     gfx::Rect layerRectToContentRect(const gfx::RectF& layerRect) const;
 
     // In impl-side painting, this returns true if this layer type is not
     // compatible with the main thread running freely, such as a double-buffered
     // 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 00:02:17]

We have accessors for draw properties that match their names. So can you make
canClipSelf (lowercase first letter here..) be an accessor for
m_drawProps.can_clip_self up with the other draw props accessors?

Let's rename this function to something that doesn't collide with the draw
property. Maybe something like allowClippingWithVertices or something more
accurate and useful.

+
 protected:
     friend class LayerImpl;
     friend class TreeSynchronizer;
     virtual ~Layer();
 
     Layer();
 
     void setNeedsCommit();
     void setNeedsFullTreeSync();
 
@@ skipping 89 matching lines @@
     WebKit::WebLayerScrollClient* m_layerScrollClient;
 
     DrawProperties<Layer, RenderSurface> m_drawProperties;
 };
 
 void sortLayers(std::vector<scoped_refptr<Layer> >::iterator, std::vector<scoped_refptr<Layer> >::iterator, void*);
 
 }  // namespace cc
 
 #endif  // CC_LAYER_H_