SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

base/android/java/src/org/chromium/base/SystemMonitor.java

Index: base/android/java/src/org/chromium/base/SystemMonitor.java
diff --git a/base/android/java/src/org/chromium/base/SystemMonitor.java b/base/android/java/src/org/chromium/base/SystemMonitor.java
deleted file mode 100644
index 138ae28d3f6cb236ceef887c0d79a619a86785b8..0000000000000000000000000000000000000000
--- a/base/android/java/src/org/chromium/base/SystemMonitor.java
+++ /dev/null
@@ -1,89 +0,0 @@
-// 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.
-
-package org.chromium.base;
-
-import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
-import android.os.BatteryManager;
-import android.os.Handler;
-import android.os.Looper;
-
-
-/**
- * Integrates native SystemMonitor with the java side.
- */
-@JNINamespace("base::android")
-public class SystemMonitor implements ActivityStatus.StateListener {
-    private static final long SUSPEND_DELAY_MS = 1 * 60 * 1000;  // 1 minute.
-    private static SystemMonitor sInstance;
-
-    private boolean mIsBatteryPower;
-    private final Handler mHandler = new Handler(Looper.getMainLooper());
-
-    // Asynchronous task used to fire the "paused" event to the native side 1 minute after the main
-    // activity transitioned to the "paused" state. This event is not sent immediately because it
-    // would be too aggressive. An Android activity can be in the "paused" state quite often. This
-    // can happen when a dialog window shows up for instance.
-    private static final Runnable sSuspendTask = new Runnable() {
-            @Override
-            public void run() {
-                nativeOnMainActivitySuspended();
-            }
-        };
-
-    public static void createForTests(Context context) {
-        // Applications will create this once the JNI side has been fully wired up both sides. For
-        // tests, we just need native -> java, that is, we don't need to notify java -> native on
-        // creation.
-        sInstance = new SystemMonitor();
-    }
-
-    public static void create(Context context) {
-        if (sInstance == null) {
-            sInstance = new SystemMonitor();
-            ActivityStatus.registerStateListener(sInstance);
-            IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
-            Intent batteryStatusIntent = context.registerReceiver(null, ifilter);
-            onBatteryChargingChanged(batteryStatusIntent);
-        }
-    }
-
-    private SystemMonitor() {
-    }
-
-    public static void onBatteryChargingChanged(Intent intent) {
-        if (sInstance == null) {
-            // We may be called by the framework intent-filter before being fully initialized. This
-            // is not a problem, since our constructor will check for the state later on.
-            return;
-        }
-        int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
-        // If we're not plugged, assume we're running on battery power.
-        sInstance.mIsBatteryPower = chargePlug != BatteryManager.BATTERY_PLUGGED_USB &&
-                                    chargePlug != BatteryManager.BATTERY_PLUGGED_AC;
-        nativeOnBatteryChargingChanged();
-    }
-
-    @Override
-    public void onActivityStateChange(int newState) {
-        if (newState == ActivityStatus.RESUMED) {
-            // Remove the callback from the message loop in case it hasn't been executed yet.
-            mHandler.removeCallbacks(sSuspendTask);
-            nativeOnMainActivityResumed();
-        } else if (newState == ActivityStatus.PAUSED) {
-            mHandler.postDelayed(sSuspendTask, SUSPEND_DELAY_MS);
-        }
-    }
-
-    @CalledByNative
-    private static boolean isBatteryPower() {
-        return sInstance.mIsBatteryPower;
-    }
-
-    private static native void nativeOnBatteryChargingChanged();
-    private static native void nativeOnMainActivitySuspended();
-    private static native void nativeOnMainActivityResumed();
-}