Get rid of last gpu_messages.h dependency in chrome by having chrome ask the GPUProcessHostUIShim...

content/browser/gpu/gpu_process_host_ui_shim.h

Index: content/browser/gpu/gpu_process_host_ui_shim.h
===================================================================
--- content/browser/gpu/gpu_process_host_ui_shim.h	(revision 110530)
+++ content/browser/gpu/gpu_process_host_ui_shim.h	(working copy)
@@ -63,7 +63,7 @@
   // Destroy all remaining GpuProcessHostUIShims.
   CONTENT_EXPORT static void DestroyAll();
 
-  static GpuProcessHostUIShim* FromID(int host_id);
+  CONTENT_EXPORT static GpuProcessHostUIShim* FromID(int host_id);
 
   // IPC::Channel::Sender implementation.
   virtual bool Send(IPC::Message* msg);
@@ -74,6 +74,10 @@
   // actually received on the IO thread.
   virtual bool OnMessageReceived(const IPC::Message& message);
 
+  CONTENT_EXPORT void SimulateRemoveAllContext();
+  CONTENT_EXPORT void SimulateCrash();
+  CONTENT_EXPORT void SimulateHang();
+
 #if defined(OS_MACOSX) || defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
   // TODO(apatrick): Remove this when mac does not use AcceleratedSurfaces for
   // when running the GPU thread in the browser process.