cc : Determine if a layer is root by using the value in LayerTreeImpl

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index a137011597039388d09e585c679c01834a19b6cd..d6a405d2419da084d076ab1fe882a8c8d698de53 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -132,6 +132,8 @@ class CC_EXPORT LayerTreeImpl {
   // ---------------------------------------------------------------------------
   LayerImpl* root_layer() const { return root_layer_; }
   void SetRootLayer(scoped_ptr<LayerImpl>);
+  bool IsRootLayer(LayerImpl* layer) const;

[ajuma, 2016/03/23 23:27:28]

Given that we have the version below that takes a const LayerImpl*, do we still
need this version that takes a non-const LayerImpl*?

[jaydasika, 2016/03/24 00:14:38]

Removed

+  bool IsRootLayer(const LayerImpl* layer) const;
   scoped_ptr<OwnedLayerImplList> DetachLayers();
   void ClearLayers();