chromeos: Add support for the battery status API on chromeos.

content/renderer/battery_status_dispatcher.h

+// Copyright (c) 2012 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_DISPATCHER_H_
+#define CONTENT_RENDERER_BATTERY_STATUS_DISPATCHER_H_
+
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "content/public/renderer/render_process_observer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebBatteryMonitor.h"
+
+namespace WebKit {
+class WebBatteryMonitorClient;
+class WebBatteryStatus;
+}
+
+namespace content {
+
+class BatteryStatusDispatcher : public RenderProcessObserver,
+                                public WebKit::WebBatteryMonitor {
+ public:
+  BatteryStatusDispatcher();
+  virtual ~BatteryStatusDispatcher();
+
+ private:
+  void OnBatteryStatusUpdated(const WebKit::WebBatteryStatus& battery_status);
+
+  void StopUpdates();
+
+  // RenderProcessObserver implementation.
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  // WebKit::WebBatteryMonitor implementation.
+  virtual void start(WebKit::WebBatteryMonitorClient* client);
+  virtual void stop(WebKit::WebBatteryMonitorClient* client);
+
+  typedef std::vector<WebKit::WebBatteryMonitorClient*>
+          WebBatteryMonitorClientList;
+  WebBatteryMonitorClientList client_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(BatteryStatusDispatcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_BATTERY_STATUS_DISPATCHER_H_