cc: Consolidate LayerList types.

cc/layers/layer_iterator.h

 // Copyright 2012 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_LAYERS_LAYER_ITERATOR_H_
 #define CC_LAYERS_LAYER_ITERATOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
 #include "cc/trees/layer_tree_host_common.h"
 
 namespace cc {
 
 // These classes provide means to iterate over the
 // RenderSurface-Layer tree.
 
 // Example code follows, for a tree of Layer/RenderSurface objects.
 // See below for details.
 //
 // void DoStuffOnLayers(
-//     const std::vector<scoped_refptr<Layer> >& render_surface_layer_list) {
+//     const LayerList& render_surface_layer_list) {
 //   typedef LayerIterator<Layer,
+//                         LayerList,
 //                         RenderSurface,
 //                         LayerIteratorActions::FrontToBack>
 //       LayerIteratorType;
 //
 //   LayerIteratorType end =
 //       LayerIteratorType::End(&render_surface_layer_list);
 //   for (LayerIteratorType
 //            it = LayerIteratorType::Begin(&render_surface_layer_list);
 //        it != end;
 //        ++it) {
@@ skipping 268 matching lines @@
               typename RenderSurfaceType,
               typename ActionType>
     void GoToHighestInSubtree(
         LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it);
   };
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_ITERATOR_H_