Implement a method to access the non-composited content root layer picture pile.

cc/layer_impl.h

Index: cc/layer_impl.h
diff --git a/cc/layer_impl.h b/cc/layer_impl.h
index 4b98f762668e94371f949c02e1b3e1d6d2b8b5e6..6fed9950fd85d188c453b6fb8dccd750c6c0e72e 100644
--- a/cc/layer_impl.h
+++ b/cc/layer_impl.h
@@ -36,6 +36,7 @@ namespace cc {
 
 class LayerTreeHostImpl;
 class LayerTreeImpl;
+class PicturePileImpl;
 class QuadSink;
 class Renderer;
 class ScrollbarAnimationController;
@@ -281,6 +282,8 @@ public:
 
     gfx::Rect layerRectToContentRect(const gfx::RectF& layerRect) const;
 
+    virtual scoped_refptr<PicturePileImpl> GetPicturePileClone() const;
+
 protected:
     LayerImpl(LayerTreeImpl* layerImpl, int);