[cc] Mailbox Output Surface Support

cc/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_LAYER_TREE_HOST_H_
 #define CC_LAYER_TREE_HOST_H_
 
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 48 matching lines @@
 struct CC_EXPORT RendererCapabilities {
     RendererCapabilities();
     ~RendererCapabilities();
 
     unsigned bestTextureFormat;
     bool usingPartialSwap;
     bool usingAcceleratedPainting;
     bool usingSetVisibility;
     bool usingSwapCompleteCallback;
     bool usingGpuMemoryManager;
-    bool usingDiscardBackbuffer;
     bool usingEglImage;
     bool allowPartialTextureUpdates;
     bool usingOffscreenContext3d;
     int maxTextureSize;
     bool avoidPow2Textures;
 };
 
 class CC_EXPORT LayerTreeHost : public RateLimiterClient {
 public:
     static scoped_ptr<LayerTreeHost> create(LayerTreeHostClient*, const LayerTreeSettings&, scoped_ptr<Thread> implThread);
@@ skipping 197 matching lines @@
     size_t m_partialTextureUpdateRequests;
 
     scoped_ptr<AnimationRegistrar> m_animationRegistrar;
 
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_HOST_H_