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

content/renderer/device_orientation/device_motion_event_pump.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_EVENT_PUMP_H_
+#define CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/shared_memory.h"
+#include "base/timer.h"
+
+#include "third_party/WebKit/Source/Platform/chromium/public/WebDeviceMotionListener.h"
+
+namespace WebKit {
+class WebDeviceMotionData;
+class WebDeviceMotionListener;
+}
+
+namespace content {
+
+class DeviceMotionSharedMemoryReader;
+
+class DeviceMotionEventPump : public WebKit::WebDeviceMotionListener {
+ public:
+  DeviceMotionEventPump();
+  virtual ~DeviceMotionEventPump();
+
+  // Sets the listener to receive updates for device motion data at
+  // regular intervals.
+  virtual void setListener(WebKit::WebDeviceMotionListener*) OVERRIDE;

[darin (slow to review), 2013/05/29 06:41:53]

s/setListener/SetListener/?  not an OVERRIDE.  does it need to be virtual?

[timvolodine, 2013/05/29 18:59:06]

Done.

+
+  virtual void didChangeDeviceMotion(

[darin (slow to review), 2013/05/29 06:41:53]

nit: add a comment indicating that this is the implementation of
WebDeviceMotionListener

[timvolodine, 2013/05/29 18:59:06]

Done.

+      const WebKit::WebDeviceMotionData&) OVERRIDE;
+
+  virtual void setDeviceMotionReader(DeviceMotionSharedMemoryReader*);

[darin (slow to review), 2013/05/29 06:41:53]

why virtual?

[timvolodine, 2013/05/29 18:59:06]

Done.

+
+ private:
+  // Delay between subsequent firing of events.
+  static const double kPumpDelayMillis;
+
+  void startFetchingDeviceMotion();

[darin (slow to review), 2013/05/29 06:41:53]

nit: use google C++ style for method naming

[timvolodine, 2013/05/29 18:59:06]

Done.

+  void stopFetchingDeviceMotion();
+  void fireEvent();
+
+  WebKit::WebDeviceMotionListener* listener_;
+  scoped_ptr<DeviceMotionSharedMemoryReader> reader_;
+  base::RepeatingTimer<DeviceMotionEventPump> timer_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_