[NO SUBMIT] Battery Status API skeleton implementation ASYNC

content/browser/battery_status/battery_status_message_filter.h

Index: content/browser/battery_status/battery_status_message_filter.h
diff --git a/content/browser/battery_status/battery_status_message_filter.h b/content/browser/battery_status/battery_status_message_filter.h
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+++ b/content/browser/battery_status/battery_status_message_filter.h
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+// 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_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MESSAGE_FILTER_H_
+#define CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MESSAGE_FILTER_H_
+
+#include "base/compiler_specific.h"
+#include "content/public/browser/browser_message_filter.h"
+#include "content/browser/battery_status/battery_status_service.h"
+
+namespace content {
+
+class RenderProcessHost;
+
+class BatteryStatusMessageFilter : public BrowserMessageFilter {
+ public:
+  BatteryStatusMessageFilter();
+
+  // BrowserMessageFilter implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+ private:
+  virtual ~BatteryStatusMessageFilter();
+
+  void OnBatteryStatusStart();
+  void OnBatteryStatusStop();
+  void SendBatteryChange(const blink::WebBatteryStatus& status);
+
+  bool is_started_;
+  BatteryStatusService::BatteryStatusUpdateCallback callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(BatteryStatusMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MESSAGE_FILTER_H_