Allow FlushSyncs to short circuit

content/common/gpu/gpu_channel.h

 // Copyright (c) 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 CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 #pragma once
 
 #include <queue>
 #include <set>
@@ skipping 108 matching lines @@
 
   // Called to add/remove a listener for a particular message routing ID.
   void AddRoute(int32 route_id, IPC::Channel::Listener* listener);
   void RemoveRoute(int32 route_id);
 
  private:
   void OnDestroy();
 
   bool OnControlMessageReceived(const IPC::Message& msg);
 
-  void HandleDeferredMessages();
+  void HandleMessage();
 
   // Message handlers.
   void OnInitialize(base::ProcessHandle renderer_process);
   void OnCreateOffscreenCommandBuffer(
       const gfx::Size& size,
       const GPUCreateCommandBufferConfig& init_params,
       IPC::Message* reply_message);
   void OnDestroyCommandBuffer(int32 route_id, IPC::Message* reply_message);
 
   void OnCreateTransportTexture(int32 context_route_id, int32 host_id);
 
   void OnEcho(const IPC::Message& message);
 
   // The lifetime of objects of this class is managed by a GpuChannelManager.
   // The GpuChannelManager destroy all the GpuChannels that they own when they
   // are destroyed. So a raw pointer is safe.
   GpuChannelManager* gpu_channel_manager_;
 
   scoped_ptr<IPC::SyncChannel> channel_;
 
-  std::queue<IPC::Message*> deferred_messages_;
+  std::deque<IPC::Message*> deferred_messages_;
 
   // The id of the renderer who is on the other side of the channel.
   int renderer_id_;
 
   // Handle to the renderer process that is on the other side of the channel.
   base::ProcessHandle renderer_process_;
 
   // The process id of the renderer process.
   base::ProcessId renderer_pid_;
 
@@ skipping 10 matching lines @@
 #endif  // defined (ENABLE_GPU)
 
   // A collection of transport textures created.
   typedef IDMap<TransportTexture, IDMapOwnPointer> TransportTextureMap;
   TransportTextureMap transport_textures_;
 
   bool log_messages_;  // True if we should log sent and received messages.
   gpu::gles2::DisallowedFeatures disallowed_features_;
   GpuWatchdog* watchdog_;
   bool software_;
+  bool handle_messages_scheduled_;
 
   ScopedRunnableMethodFactory<GpuChannel> task_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannel);
 };
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_H_