[Aura] Added Support for rendering software compositor frames as cc::TextureLayers.

cc/layers/texture_layer.h

 // Copyright 2010 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_TEXTURE_LAYER_H_
 #define CC_LAYERS_TEXTURE_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 44 matching lines @@
 
   // Sets whether this context should rate limit on damage to prevent too many
   // frames from being queued up before the compositor gets a chance to run.
   // Requires a non-nil client.  Defaults to false.
   void SetRateLimitContext(bool rate_limit);
 
   // Code path for plugins which supply their own texture ID.
   void SetTextureId(unsigned texture_id);
 
   // Code path for plugins which supply their own mailbox.
+  bool uses_mailbox() const { return uses_mailbox_; }
   void SetTextureMailbox(const TextureMailbox& mailbox);
 
   void WillModifyTexture();
 
   virtual void SetNeedsDisplayRect(const gfx::RectF& dirty_rect) OVERRIDE;
 
   virtual void SetLayerTreeHost(LayerTreeHost* layer_tree_host) OVERRIDE;
   virtual bool DrawsContent() const OVERRIDE;
   virtual void Update(ResourceUpdateQueue* queue,
                       const OcclusionTracker* occlusion,
@@ skipping 23 matching lines @@
 
   unsigned texture_id_;
   TextureMailbox texture_mailbox_;
   bool own_mailbox_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayer);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_TEXTURE_LAYER_H_