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

content/renderer/device_orientation/device_motion_shared_memory_reader.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_RENDERER_DEVICE_MOTION_SHARED_MEMORY_READER_H_
+#define CONTENT_RENDERER_DEVICE_MOTION_SHARED_MEMORY_READER_H_
+
+#include "base/shared_memory.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace WebKit {
+class WebDeviceMotionData;
+}
+
+namespace content {
+
+struct DeviceMotionHardwareBuffer;
+
+class DeviceMotionSharedMemoryReader {
+ public:
+  DeviceMotionSharedMemoryReader();
+  virtual ~DeviceMotionSharedMemoryReader() { }
+
+  virtual bool GetLatestDeviceMotionData(WebKit::WebDeviceMotionData& data);

[darin (slow to review), 2013/06/17 05:27:46]

nit: google c++ style disallows non-const reference arguments.  data should be
passed by pointer instead.

[timvolodine, 2013/06/17 20:10:55]

Done.

+  virtual bool Initialize(base::SharedMemoryHandle shared_memory_handle);
+
+ private:
+  base::SharedMemoryHandle renderer_shared_memory_handle_;
+  scoped_ptr<base::SharedMemory> renderer_shared_memory_;
+  DeviceMotionHardwareBuffer* device_motion_hardware_buffer_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_DEVICE_MOTION_SHARED_MEMORY_READER_H_