Allow WebExternalTextureLayers to receive a bitmap along with a mailbox

cc/trees/layer_tree_host.h

 // Copyright 2011 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_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <vector>
 
@@ skipping 62 matching lines @@
 
   unsigned best_texture_format;
   bool using_partial_swap;
   bool using_set_visibility;
   bool using_egl_image;
   bool allow_partial_texture_updates;
   bool using_offscreen_context3d;
   int max_texture_size;
   bool avoid_pow2_textures;
   bool using_map_image;
+  bool using_shared_memory_resources;
 };
 
 class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
  public:
   static scoped_ptr<LayerTreeHost> Create(
       LayerTreeHostClient* client,
       const LayerTreeSettings& settings,
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   virtual ~LayerTreeHost();
 
@@ skipping 155 matching lines @@
 
   skia::RefPtr<SkPicture> CapturePicture();
 
   bool BlocksPendingCommit() const;
 
   // Obtains a thorough dump of the LayerTreeHost as a value.
   scoped_ptr<base::Value> AsValue() const;
 
   bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
 
+  bool UsingSharedMemoryResources();
+
  protected:
   LayerTreeHost(LayerTreeHostClient* client, const LayerTreeSettings& settings);
   bool Initialize(scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   bool InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing);
 
  private:
   bool InitializeProxy(scoped_ptr<Proxy> proxy);
 
   bool PaintLayerContents(const LayerList& render_surface_layer_list,
                           ResourceUpdateQueue* quue);
@@ skipping 93 matching lines @@
     int64 total_num_cc_layers_will_use_lcd_text;
   };
   LCDTextMetrics lcd_text_metrics_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_