Mac: Don't hang gpu process on popup close under certain conditions

gpu/command_buffer/service/gpu_processor.h

 // Copyright (c) 2009 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_PROCESSOR_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_PROCESSOR_H_
 
 #include <vector>
 
 #include "app/surface/transport_dib.h"
@@ skipping 79 matching lines @@
   virtual uint64 GetSurfaceId();
   // To prevent the GPU process from overloading the browser process,
   // we need to track the number of swap buffers calls issued and
   // acknowledged per on-screen (IOSurface-backed) context, and keep
   // the GPU from getting too far ahead of the browser. Note that this
   // is also predicated on a flow control mechanism between the
   // renderer and GPU processes.
   uint64 swap_buffers_count() const;
   void set_acknowledged_swap_buffers_count(
       uint64 acknowledged_swap_buffers_count);
+
+  void DidDestroySurface();
 #endif
 
   // Sets a callback that is called when a glResizeCHROMIUM command
   // is processed.
   virtual 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.
   virtual void SetSwapBuffersCallback(Callback0::Type* callback);
@@ skipping 32 matching lines @@
   uint64 acknowledged_swap_buffers_count_;
 #endif
 
   ScopedRunnableMethodFactory<GPUProcessor> method_factory_;
   scoped_ptr<Callback0::Type> wrapped_swap_buffers_callback_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_PROCESSOR_H_