Add BatteryStatusEventPump in Chromium for sending Battery status events

content/renderer/battery_status/battery_status_event_pump.h

+// Copyright (c) 2014 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_BATTERY_STATUS_BATTERY_STATUS_EVENT_PUMP_H_
+#define CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_EVENT_PUMP_H_
+
+#include "content/public/renderer/render_process_observer.h"
+#include "content/public/renderer/render_thread.h"
+#include "third_party/WebKit/public/platform/WebBatteryStatusListener.h"
+
+namespace blink {
+class WebBatteryStatus;
+}
+
+namespace content {
+
+class CONTENT_EXPORT BatteryStatusEventPump : public RenderProcessObserver {
+ public:
+  BatteryStatusEventPump();
+  virtual ~BatteryStatusEventPump();
+  void SetBatteryStatusListener(blink::WebBatteryStatusListener* listener);
+
+  void Attach(RenderThread* thread);
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ private:
+  blink::WebBatteryStatusListener* listener_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_EVENT_PUMP_H_