Add Battery Status API support in content/renderer and IPC messages.

content/renderer/battery_status/battery_status_dispatcher.h

Index: content/renderer/battery_status/battery_status_dispatcher.h
diff --git a/content/renderer/battery_status/battery_status_dispatcher.h b/content/renderer/battery_status/battery_status_dispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..0358fa792d2b097f4fe7a378b0ef010628bcde84
--- /dev/null
+++ b/content/renderer/battery_status/battery_status_dispatcher.h
@@ -0,0 +1,44 @@
+// Copyright 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_DISPATCHER_H_
+#define CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_
+
+#include "content/public/renderer/render_process_observer.h"
+
+namespace blink {
+class WebBatteryStatus;
+class WebBatteryStatusListener;
+}
+
+namespace content {
+class RenderThread;
+
+class CONTENT_EXPORT BatteryStatusDispatcher : public RenderProcessObserver {
+ public:
+  explicit BatteryStatusDispatcher(RenderThread* thread);
+  virtual ~BatteryStatusDispatcher();
+
+  // RenderProcessObserver method.
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  // Sets the listener to receive battery status updates. Returns true if the
+  // registration was successful.
+  bool SetListener(blink::WebBatteryStatusListener* listener);
+
+ protected:
+  virtual bool Start();
+  virtual bool Stop();
+
+ private:
+  void OnDidChange(const blink::WebBatteryStatus& status);
+
+  blink::WebBatteryStatusListener* listener_;
+
+  DISALLOW_COPY_AND_ASSIGN(BatteryStatusDispatcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_