Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/accelerometer_mac.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_
 #define CONTENT_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/device_orientation/data_fetcher.h"
+#include "content/browser/device_orientation/device_data.h"
 
 class SuddenMotionSensor;
 
 namespace device_orientation {
 
+class Orientation;
+
 class AccelerometerMac : public DataFetcher {
  public:
   static DataFetcher* Create();
 
   // Implement DataFetcher.
-  virtual bool GetOrientation(Orientation* orientation) OVERRIDE;
+  virtual const DeviceData* GetDeviceData(DeviceData::Type type) OVERRIDE;
 
   virtual ~AccelerometerMac();
 
  private:
   AccelerometerMac();
   bool Init();
+  const Orientation* GetOrientation();
 
   scoped_ptr<SuddenMotionSensor> sudden_motion_sensor_;
 };
 
 }  // namespace device_orientation
 
 #endif  // CONTENT_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_