Revert of Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

ui/ozone/platform/dri/ozone_platform_dri.cc

 // Copyright 2013 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.
 
 #include "ui/ozone/platform/dri/ozone_platform_dri.h"
 
 #include "base/at_exit.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
@@ skipping 53 matching lines @@
   // OzonePlatform:
   virtual ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() OVERRIDE {
     return surface_factory_ozone_.get();
   }
   virtual EventFactoryOzone* GetEventFactoryOzone() OVERRIDE {
     return event_factory_ozone_.get();
   }
   virtual CursorFactoryOzone* GetCursorFactoryOzone() OVERRIDE {
     return cursor_factory_ozone_.get();
   }
+  virtual GpuPlatformSupport* GetGpuPlatformSupport() OVERRIDE {
+    return NULL;  // no GPU support
+  }
+  virtual GpuPlatformSupportHost* GetGpuPlatformSupportHost() OVERRIDE {
+    return NULL;  // no GPU support
+  }
 #if defined(OS_CHROMEOS)
   virtual scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
       OVERRIDE {
     return scoped_ptr<NativeDisplayDelegate>(new NativeDisplayDelegateDri(
         dri_.get(), screen_manager_.get(), device_manager_.get()));
   }
   virtual scoped_ptr<TouchscreenDeviceManager>
       CreateTouchscreenDeviceManager() OVERRIDE {
     return scoped_ptr<TouchscreenDeviceManager>(
         new TouchscreenDeviceManagerOzone());
@@ skipping 22 matching lines @@
   scoped_ptr<EventFactoryEvdev> event_factory_ozone_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformDri);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformDri() { return new OzonePlatformDri; }
 
 }  // namespace ui