Let GpuChannel handle deferred IPC messages of SwapBuffer in batch

content/common/gpu/gpu_channel.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_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 149 matching lines @@
       const GPUCreateCommandBufferConfig& init_params,
       int32 route_id,
       bool* succeeded);
   void OnDestroyCommandBuffer(int32 route_id);
   void OnDevToolsStartEventsRecording(int32 route_id, bool* succeeded);
   void OnDevToolsStopEventsRecording();
 
   // Decrement the count of unhandled IPC messages and defer preemption.
   void MessageProcessed();
 
+  // Try to match the messages pattern for GL SwapBuffers operation in the
+  // deferred message queue starting from the current processing message.
+  // Return the number of messages that matches the given pattern, e.g.
+  // SetLatencyInfo -> AsyncFlush -> Echo sequence.
+  size_t MatchSwapBufferMessagesPattern(IPC::Message* current_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_;
 
   uint64 messages_processed_;
 
   // Whether the processing of IPCs on this channel is stalled and we should
@@ skipping 40 matching lines @@
   size_t num_stubs_descheduled_;
 
   bool allow_future_sync_points_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannel);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_H_