Added GPU process "echo" IPC message.

gpu/command_buffer/service/gpu_scheduler.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 GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 
 #include <map>
 #include <queue>
 #include <vector>
@@ skipping 109 matching lines @@
   virtual TransportDIB::Handle SetWindowSizeForTransportDIB(
       const gfx::Size& size);
   virtual void SetTransportDIBAllocAndFree(
       Callback2<size_t, TransportDIB::Handle*>::Type* allocator,
       Callback1<TransportDIB::Id>::Type* deallocator);
   // Returns the id of the current surface that is being rendered to
   // (or 0 if no such surface has been created).
   virtual uint64 GetSurfaceId();
 
   void DidDestroySurface();
+
+  // Sets a callback which is called when a SwapBuffers command is processed.
+  // Must be called after Initialize().
+  // It is not defined on which thread this callback is called.
+  void SetSwapBuffersCallback(Callback0::Type* callback);
 #endif
 
   // Sets a callback that is called when a glResizeCHROMIUM command
   // is processed.
   void SetResizeCallback(Callback1<gfx::Size>::Type* callback);
 
-  // Sets a callback which is called when a SwapBuffers command is processed.
-  // Must be called after Initialize().
-  // It is not defined on which thread this callback is called.
-  void SetSwapBuffersCallback(Callback0::Type* callback);
-
   void SetCommandProcessedCallback(Callback0::Type* callback);
 
   // Get the GLES2Decoder associated with this scheduler.
   gles2::GLES2Decoder* decoder() const { return decoder_.get(); }
 
  private:
   // If a group is not passed in one will be created.
   GpuScheduler(CommandBuffer* command_buffer,
                gles2::GLES2Decoder* decoder,
                CommandParser* parser);
 
+#if defined(OS_MACOSX)
   // Called via a callback just before we are supposed to call the
   // user's swap buffers callback.
   void WillSwapBuffers();
+#endif
 
   // The GpuScheduler holds a weak reference to the CommandBuffer. The
   // CommandBuffer owns the GpuScheduler and holds a strong reference to it
   // through the ProcessCommands callback.
   CommandBuffer* command_buffer_;
 
   scoped_ptr<gles2::GLES2Decoder> decoder_;
   scoped_ptr<CommandParser> parser_;
 
   // Greater than zero if this is waiting to be rescheduled before continuing.
   int unscheduled_count_;
 
   scoped_ptr<Callback0::Type> scheduled_callback_;
 
 #if defined(OS_MACOSX)
   uint64 swap_buffers_count_;
   uint64 acknowledged_swap_buffers_count_;
   scoped_ptr<AcceleratedSurface> surface_;
+  scoped_ptr<Callback0::Type> wrapped_swap_buffers_callback_;
 #endif
 
   ScopedRunnableMethodFactory<GpuScheduler> method_factory_;
-  scoped_ptr<Callback0::Type> wrapped_swap_buffers_callback_;
   scoped_ptr<Callback0::Type> command_processed_callback_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_