Revert of Get rid of gpu related switches by passing gpu::GpuPreferences via IPC.

content/gpu/gpu_child_thread.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_GPU_GPU_CHILD_THREAD_H_
 #define CONTENT_GPU_GPU_CHILD_THREAD_H_
 
 #include <stdint.h>
 
 #include <queue>
@@ skipping 53 matching lines @@
                  GpuMemoryBufferFactory* gpu_memory_buffer_factory,
                  gpu::SyncPointManager* sync_point_manager);
 
   ~GpuChildThread() override;
 
   void Shutdown() override;
 
   void Init(const base::Time& process_start_time);
   void StopWatchdog();
 
+  static gpu::GpuPreferences GetGpuPreferencesFromCommandLine();
+
  private:
   // ChildThread overrides.
   bool Send(IPC::Message* msg) override;
   bool OnControlMessageReceived(const IPC::Message& msg) override;
   bool OnMessageReceived(const IPC::Message& msg) override;
 
   // GpuChannelManagerDelegate implementation.
   void AddSubscription(int32_t client_id, unsigned int target) override;
   void DidCreateOffscreenContext(const GURL& active_url) override;
   void DidDestroyChannel(int client_id) override;
@@ skipping 10 matching lines @@
 #if defined(OS_WIN)
   void SendAcceleratedSurfaceCreatedChildWindow(
       const gfx::PluginWindowHandle& parent_window,
       const gfx::PluginWindowHandle& child_window) override;
 #endif
   void StoreShaderToDisk(int32_t client_id,
                          const std::string& key,
                          const std::string& shader) override;
 
   // Message handlers.
-  void OnInitialize(const gpu::GpuPreferences& gpu_preferences);
+  void OnInitialize();
   void OnFinalize();
   void OnCollectGraphicsInfo();
   void OnGetVideoMemoryUsageStats();
   void OnSetVideoMemoryWindowCount(uint32_t window_count);
 
   void OnClean();
   void OnCrash();
   void OnHang();
   void OnDisableWatchdog();
   void OnGpuSwitched();
@@ skipping 55 matching lines @@
 
   // Bindings to the ProcessControl impl.
   mojo::BindingSet<ProcessControl> process_control_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_CHILD_THREAD_H_