Revert of Replace Chrome IPC with Mojo IPC for querying BatteryStatus service

content/browser/battery_status/battery_status_manager.h

+// 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 CHROME_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MANAGER_H_
+#define CHROME_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MANAGER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "build/build_config.h"
+#include "content/browser/battery_status/battery_status_service.h"
+
+namespace content {
+
+// Platform specific manager class for fetching battery status data.
+class CONTENT_EXPORT BatteryStatusManager {
+ public:
+  // Creates a BatteryStatusManager object. |callback| should be called when the
+  // battery status changes.
+  static scoped_ptr<BatteryStatusManager> Create(
+      const BatteryStatusService::BatteryUpdateCallback& callback);
+
+  virtual ~BatteryStatusManager() {}
+
+  // Start listening for battery status changes. New updates are signalled
+  // by invoking the callback provided at construction time.
+  // Note that this is called in the IO thread.
+  virtual bool StartListeningBatteryChange() = 0;
+
+  // Stop listening for battery status changes.
+  // Note that this is called in the IO thread.
+  virtual void StopListeningBatteryChange() = 0;
+};
+
+}  // namespace content
+
+#endif  // CHROME_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MANAGER_H_