Implement the content/renderer and content/browser part of the Device Motion API.

content/browser/device_orientation/device_motion_provider.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 CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_PROVIDER_H_
+#define CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_PROVIDER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/shared_memory.h"
+#include "content/common/content_export.h"
+#include "content/common/device_motion_hardware_buffer.h"
+
+namespace content {
+
+// TODO(timvolodine) Implement this class properly.

[palmer, 2013/07/10 18:23:48]

What does "properly" mean? Why not do it now? :)

[timvolodine, 2013/07/10 21:17:50]

because the data fetcher is not there yet, it's being implemented as part of a
separate CL (see https://codereview.chromium.org/18572014/).
I've modified the comment to be more specific ;).

+
+class CONTENT_EXPORT DeviceMotionProvider {
+ public:
+  DeviceMotionProvider();
+  virtual ~DeviceMotionProvider();
+
+  // Returns the shared memory handle of the device motion data duplicated
+  // into the given process.
+  base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
+      base::ProcessHandle renderer_process);
+
+  // Pause and resume the background polling thread. Can be called from any
+  // thread.
+  void StartFetchingDeviceMotionData();
+  void StopFetchingDeviceMotionData();
+
+ private:
+  static DeviceMotionProvider* instance_;
+
+  base::SharedMemory device_motion_shared_memory_;
+
+  DeviceMotionHardwareBuffer* SharedMemoryAsHardwareBuffer();
+
+  // FIXME: add member variable,

[palmer, 2013/07/10 18:23:48]

Use TODO(timvolodine) instead of FIXME.

[timvolodine, 2013/07/10 21:17:50]

Done.

+  // scoped_ptr<DataFetcherSharedMemory> data_fetcher_;
+
+  bool is_started_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceMotionProvider);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_PROVIDER_H_