Implement Android shared memory data fetcher for Device Motion.

content/browser/device_orientation/data_fetcher_platform.h

+// Copyright (c) 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.
+
+#ifndef CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_PLATFORM_H_
+#define CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_PLATFORM_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "content/browser/device_orientation/data_fetcher_shared_memory.h"
+
+#if defined(OS_ANDROID)
+#include "content/browser/device_orientation/data_fetcher_impl_android.h"
+#endif
+
+namespace content {
+
+#if defined(OS_ANDROID)
+
+typedef DataFetcherImplAndroid SharedMemoryPlatformDataFetcher;
+
+#else
+
+typedef SharedMemoryPlatformDataFetcherEmpty SharedMemoryPlatformDataFetcher;
+
+#endif
+
+class SharedMemoryPlatformDataFetcherEmpty : public DataFetcherSharedMemory {
+ public:
+  static SharedMemoryPlatformDataFetcherEmpty* instance();
+
+  virtual bool NeedsPolling() OVERRIDE;
+  virtual bool FetchDeviceMotionDataIntoBuffer() OVERRIDE;
+  virtual bool StartFetchingDeviceMotionData(
+      DeviceMotionHardwareBuffer* buffer) OVERRIDE;
+  virtual void StopFetchingDeviceMotionData() OVERRIDE;
+
+ private:
+  SharedMemoryPlatformDataFetcherEmpty();
+  virtual ~SharedMemoryPlatformDataFetcherEmpty() { }
+
+  DeviceMotionHardwareBuffer* device_motion_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SharedMemoryPlatformDataFetcherEmpty);
+};
+
+}  // namespace content
+
+#endif  // CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_PLATFORM_H_