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

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index b3f6419ae238373e1411c073a01dee86b50475b3..90703a7ec59e801ad734f208254c0c0148290aad 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -40,6 +40,7 @@ struct ChannelHandle;
 }
 
 namespace gpu {
+struct GpuPreferences;
 struct SyncToken;
 }
 
@@ -52,7 +53,7 @@ class RenderWidgetHostViewFrameSubscriber;
 class ShaderDiskCache;
 
 typedef base::Thread* (*GpuMainThreadFactoryFunction)(
-    const InProcessChildThreadParams&);
+    const InProcessChildThreadParams&, const gpu::GpuPreferences&);
 
 class GpuProcessHost : public BrowserChildProcessHostDelegate,
                        public IPC::Sender,