Rewrite the Android implementation of BatteryMonitor directly in Java.

device/battery/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.
-
-#include "base/android/scoped_java_ref.h"
-#include "base/macros.h"
-#include "device/battery/battery_status_manager.h"
-
-#ifndef DEVICE_BATTERY_BATTERY_STATUS_MANAGER_ANDROID_H_
-#define DEVICE_BATTERY_BATTERY_STATUS_MANAGER_ANDROID_H_
-
-namespace device {
-
-class BatteryStatusManagerAndroid : public BatteryStatusManager {
- public:
-  explicit BatteryStatusManagerAndroid(
-      const BatteryStatusService::BatteryUpdateCallback& callback);
-  virtual ~BatteryStatusManagerAndroid();
-
-  // Must be called at startup.
-  static bool Register(JNIEnv* env);
-
-  // Called from Java via JNI.
-  void GotBatteryStatus(JNIEnv*,
-                        jobject,
-                        jboolean charging,
-                        jdouble charging_time,
-                        jdouble discharging_time,
-                        jdouble level);
-
- private:
-  // BatteryStatusManager:
-  virtual bool StartListeningBatteryChange() override;
-  virtual void StopListeningBatteryChange() override;
-
-  BatteryStatusService::BatteryUpdateCallback callback_;
-  // Java provider of battery status info.
-  base::android::ScopedJavaGlobalRef<jobject> j_manager_;
-
-  DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerAndroid);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_BATTERY_BATTERY_STATUS_MANAGER_ANDROID_H_