zero-copy: Clarify to allocate/destroy GpuMemoryBuffer on any thread and use it on the main thread o

content/common/gpu/gpu_channel_manager.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_CHANNEL_MANAGER_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/common/gpu/gpu_memory_manager.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_surface.h"
 
+struct GpuMsg_CreateGpuMemoryBuffer_Params;
+
 namespace base {
 class WaitableEvent;
 }
 
 namespace gfx {
 class GLShareGroup;
 struct GpuMemoryBufferHandle;
 }
 
 namespace gpu {
 class SyncPointManager;
 union ValueState;
 namespace gles2 {
 class MailboxManager;
 class ProgramCache;
 class ShaderTranslatorCache;
 }
 }
 
 namespace IPC {
 struct ChannelHandle;
 class SyncChannel;
-class MessageFilter;
 }
 
 struct GPUCreateCommandBufferConfig;
 
 namespace content {
 class GpuChannel;
 class GpuMemoryBufferFactory;
 class GpuWatchdog;
 class MessageRouter;
 
@@ skipping 55 matching lines @@
   void OnCloseChannel(const IPC::ChannelHandle& channel_handle);
   void OnVisibilityChanged(
       int32 render_view_id, int32 client_id, bool visible);
   void OnCreateViewCommandBuffer(
       const gfx::GLSurfaceHandle& window,
       int32 render_view_id,
       int32 client_id,
       const GPUCreateCommandBufferConfig& init_params,
       int32 route_id);
   void OnLoadedShader(std::string shader);
+  void OnCreateGpuMemoryBuffer(
+      const GpuMsg_CreateGpuMemoryBuffer_Params& params);
   void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id, int client_id);
-  void DestroyGpuMemoryBufferOnIO(gfx::GpuMemoryBufferId id, int client_id);
   void OnDestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                 int client_id,
                                 int32 sync_point);
 
   void OnRelinquishResources();
   void OnResourcesRelinquished();
 
   void OnUpdateValueState(int client_id,
                           unsigned int target,
                           const gpu::ValueState& state);
@@ skipping 14 matching lines @@
   scoped_refptr<gfx::GLShareGroup> share_group_;
   scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
   GpuMemoryManager gpu_memory_manager_;
   GpuWatchdog* watchdog_;
   scoped_refptr<gpu::SyncPointManager> sync_point_manager_;
   scoped_ptr<gpu::gles2::ProgramCache> program_cache_;
   scoped_refptr<gpu::gles2::ShaderTranslatorCache> shader_translator_cache_;
   scoped_refptr<gfx::GLSurface> default_offscreen_surface_;
   scoped_ptr<GpuMemoryBufferFactory> gpu_memory_buffer_factory_;
   IPC::SyncChannel* channel_;
-  scoped_refptr<IPC::MessageFilter> filter_;
   bool relinquish_resources_pending_;
 
   // Member variables should appear before the WeakPtrFactory, to ensure
   // that any WeakPtrs to Controller are invalidated before its members
   // variable's destructors are executed, rendering them invalid.
   base::WeakPtrFactory<GpuChannelManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_H_