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

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 25922c8698732081cf7750d02ded974be57e5ea5..5edf5e8d8ea34395308ea52b5347a641f86a2a55 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -313,6 +313,8 @@ public:
 
     const PinchZoomViewport& pinchZoomViewport() const { return m_pinchZoomViewport; }
 
+    scoped_refptr<PicturePileImpl> capturePicturePile();
+
 protected:
     LayerTreeHostImpl(const LayerTreeSettings&, LayerTreeHostImplClient*, Proxy*);
     void activatePendingTree();
@@ -359,6 +361,8 @@ private:
 
     void dumpRenderSurfaces(std::string*, int indent, const LayerImpl*) const;
 
+    static LayerImpl* getNonCompositedContentRootLayerRecursive(LayerImpl* layer);
+
     scoped_ptr<OutputSurface> m_outputSurface;
     scoped_ptr<ResourceProvider> m_resourceProvider;
     scoped_ptr<Renderer> m_renderer;