Battery Status API: add plumbing for multi-platform support.

content/browser/battery_status/battery_status_manager_android.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_ANDROID_H_
-#define CHROME_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MANAGER_ANDROID_H_
-
-#include "base/android/scoped_java_ref.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-// Android implementation of Battery Status API.
-class CONTENT_EXPORT BatteryStatusManagerAndroid {
- public:
-  // Must be called at startup.
-  static bool Register(JNIEnv* env);
-
-  // Called from Java via JNI.
-  void GotBatteryStatus(JNIEnv*, jobject, jboolean charging,
-                        jdouble chargingTime, jdouble dischargingTime,
-                        jdouble level);
-
-  bool StartListeningBatteryChange();
-  void StopListeningBatteryChange();
-
- protected:
-  BatteryStatusManagerAndroid();
-  virtual ~BatteryStatusManagerAndroid();
-
- private:
-  // Java provider of battery status info.
-  base::android::ScopedJavaGlobalRef<jobject> j_manager_;
-
-  DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerAndroid);
-};
-
-}  // namespace content
-
-#endif  // CHROME_BROWSER_BATTERY_STATUS_BATTERY_STATUS_MANAGER_ANDROID_H_