Remove GPU relinquish resources infrastructure and stop GPU process.

content/browser/gpu/gpu_process_host_ui_shim.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_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 
 // This class lives on the UI thread and supports classes like the
 // BackingStoreProxy, which must live on the UI thread. The IO thread
 // portion of this class, the GpuProcessHost, is responsible for
@@ skipping 47 matching lines @@
 
   // Destroy all remaining GpuProcessHostUIShims.
   CONTENT_EXPORT static void DestroyAll();
 
   CONTENT_EXPORT static GpuProcessHostUIShim* FromID(int host_id);
 
   // Get a GpuProcessHostUIShim instance; it doesn't matter which one.
   // Return NULL if none has been created.
   CONTENT_EXPORT static GpuProcessHostUIShim* GetOneInstance();
 
+  // Stops the GPU process.
+  void StopGpuProcess(base::Closure callback);

[Zhenyao Mo, 2015/07/27 16:23:12]

should callback be const reference type?

+
   // IPC::Sender implementation.
   bool Send(IPC::Message* msg) override;
 
   // IPC::Listener implementation.
   // The GpuProcessHost causes this to be called on the UI thread to
   // dispatch the incoming messages from the GPU process, which are
   // actually received on the IO thread.
   bool OnMessageReceived(const IPC::Message& message) override;
 
-  CONTENT_EXPORT void RelinquishGpuResources(const base::Closure& callback);
   CONTENT_EXPORT void SimulateRemoveAllContext();
   CONTENT_EXPORT void SimulateCrash();
   CONTENT_EXPORT void SimulateHang();
 
  private:
   explicit GpuProcessHostUIShim(int host_id);
   ~GpuProcessHostUIShim() override;
 
   // Message handlers.
   bool OnControlMessageReceived(const IPC::Message& message);
 
   void OnLogMessage(int level, const std::string& header,
       const std::string& message);
 
   void OnGraphicsInfoCollected(const gpu::GPUInfo& gpu_info);
 
   void OnAcceleratedSurfaceInitialized(int32 surface_id, int32 route_id);
 #if defined(OS_MACOSX)
   void OnAcceleratedSurfaceBuffersSwapped(
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params);
 #endif
   void OnVideoMemoryUsageStatsReceived(
       const GPUVideoMemoryUsageStats& video_memory_usage_stats);
-  void OnResourcesRelinquished();
   void OnAddSubscription(int32 process_id, unsigned int target);
   void OnRemoveSubscription(int32 process_id, unsigned int target);
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
-  base::Closure relinquish_callback_;
+  base::Closure close_callback_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_