Added GPU process "echo" IPC message.

webkit/plugins/ppapi/ppb_surface_3d_impl.h

Index: webkit/plugins/ppapi/ppb_surface_3d_impl.h
===================================================================
--- webkit/plugins/ppapi/ppb_surface_3d_impl.h	(revision 98655)
+++ webkit/plugins/ppapi/ppb_surface_3d_impl.h	(working copy)
@@ -6,6 +6,7 @@
 #define WEBKIT_PLUGINS_PPAPI_PPB_SURFACE_3D_IMPL_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/task.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_surface_3d_api.h"
 #include "webkit/plugins/ppapi/callbacks.h"
@@ -75,6 +76,8 @@
   // The context this surface is currently bound to.
   PPB_Context3D_Impl* context_;
 
+  ScopedRunnableMethodFactory<PPB_Surface3D_Impl> method_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PPB_Surface3D_Impl);
 };