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

content/gpu/gpu_child_thread.h

Index: content/gpu/gpu_child_thread.h
diff --git a/content/gpu/gpu_child_thread.h b/content/gpu/gpu_child_thread.h
index ec7d19edc993e7a7d1c98e9b94affa5c3c2860ad..80a24127f02b3d571b2e84a9272658c18d36b1b9 100644
--- a/content/gpu/gpu_child_thread.h
+++ b/content/gpu/gpu_child_thread.h
@@ -71,8 +71,6 @@ class GpuChildThread : public ChildThreadImpl,
   void Init(const base::Time& process_start_time);
   void StopWatchdog();
 
-  static gpu::GpuPreferences GetGpuPreferencesFromCommandLine();
-
  private:
   // ChildThread overrides.
   bool Send(IPC::Message* msg) override;
@@ -103,7 +101,7 @@ class GpuChildThread : public ChildThreadImpl,
                          const std::string& shader) override;
 
   // Message handlers.
-  void OnInitialize();
+  void OnInitialize(const gpu::GpuPreferences& gpu_preferences);
   void OnFinalize();
   void OnCollectGraphicsInfo();
   void OnGetVideoMemoryUsageStats();