Added a way for sync point clients to issue out of order waits.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 414 matching lines @@
 
   // Returns the global order number for the last unprocessed IPC message.
   uint32_t GetProcessedOrderNum() const;
 
   bool HasQueuedMessages() const;
 
   base::TimeTicks GetNextMessageTimeTick() const;
 
   GpuChannelMessage* GetNextMessage() const;
 
+  // Should be called before a message begins to be processed.
   void BeginMessageProcessing(const GpuChannelMessage* msg);
 
+  // Should be called if a message began processing but did not finish.
+  void PauseMessageProcessing(const GpuChannelMessage* msg);
+
   // Should be called after a message returned by GetNextMessage is processed.
   // Returns true if there are more messages on the queue.
   bool MessageProcessed();
 
   void PushBackMessage(const IPC::Message& message);
 
   bool GenerateSyncPointMessage(const IPC::Message& message,
                                 bool retire_sync_point,
                                 uint32_t* sync_point_number);
 
@@ skipping 25 matching lines @@
   base::WeakPtr<GpuChannel> gpu_channel_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   gpu::SyncPointManager* sync_point_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelMessageQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_H_