Chromium implementation of discardBackbuffer WebGraphicsContext3D extension.

content/common/gpu/gpu_command_buffer_stub.h

 // Copyright (c) 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 CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #define CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
@@ skipping 177 matching lines @@
   void OnDestroyTransferBuffer(int32 id, IPC::Message* reply_message);
   void OnGetTransferBuffer(int32 id, IPC::Message* reply_message);
 
   void OnCreateVideoDecoder(
       media::VideoDecodeAccelerator::Profile profile,
       IPC::Message* reply_message);
   void OnDestroyVideoDecoder(int32 decoder_route_id);
 
   void OnSetSurfaceVisible(bool visible);
 
+  void OnDiscardBackbuffer();
+  void OnEnsureBackbuffer();
+
   void OnReschedule();
 
   void OnCommandProcessed();
   void OnParseError();
 
   void ReportState();
 
   // The lifetime of objects of this class is managed by a GpuChannel. The
   // GpuChannels destroy all the GpuCommandBufferStubs that they own when they
   // are destroyed. So a raw pointer is safe.
@@ skipping 34 matching lines @@
   IDMap<GpuVideoDecodeAccelerator, IDMapOwnPointer> video_decoders_;
 
   ObserverList<DestructionObserver> destruction_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 #endif  // defined(ENABLE_GPU)
 
 #endif  // CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_