Implement DeviceMotionEvent API

ash/content/display/screen_orientation_controller_chromeos.h

 // Copyright 2014 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.
 
 #ifndef ASH_CONTENT_DISPLAY_SCREEN_ORIENTATION_CONTROLLER_CHROMEOS_H_
 #define ASH_CONTENT_DISPLAY_SCREEN_ORIENTATION_CONTROLLER_CHROMEOS_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 64 matching lines @@
   // aura::client::ActivationChangeObserver:
   void OnWindowActivated(aura::Window* gained_active,
                          aura::Window* lost_active) override;
 
   // aura::WindowObserver:
   void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
   void OnWindowDestroying(aura::Window* window) override;
 
   // chromeos::AccelerometerReader::Observer:
   void OnAccelerometerUpdated(
-      const chromeos::AccelerometerUpdate& update) override;
+      scoped_refptr<const chromeos::AccelerometerUpdate> update) override;
 
   // content::ScreenOrientationDelegate:
   bool FullScreenRequired(content::WebContents* web_contents) override;
   void Lock(content::WebContents* web_contents,
             blink::WebScreenOrientationLockType lock_orientation) override;
   bool ScreenOrientationProviderSupported() override;
   void Unlock(content::WebContents* web_contents) override;
 
   // DisplayController::Observer:
   void OnDisplayConfigurationChanged() override;
@@ skipping 84 matching lines @@
   // Tracks all windows that have requested a lock, as well as the requested
   // orientation.
   std::map<aura::Window*, blink::WebScreenOrientationLockType> locking_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_CONTENT_DISPLAY_SCREEN_ORIENTATION_CONTROLLER_CHROMEOS_H_