[Offline pages] Creating BackgroundJobScheduler, which uses JobScheduler

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java

 // Copyright 2016 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.chrome.browser.offlinepages;
 
 import android.content.Context;
 import android.os.Bundle;
 
 import org.chromium.base.ApplicationStatus;
@@ skipping 42 matching lines @@
      * Also starts UMA collection.
      *
      * @returns true for success
      */
     private boolean startBackgroundRequestsImpl(
             Context context, Bundle bundle, final ChromeBackgroundServiceWaiter waiter) {
         // Set up backup scheduled task in case processing is killed before RequestCoordinator
         // has a chance to reschedule base on remaining work.
         TriggerConditions previousTriggerConditions =
                 TaskExtrasPacker.unpackTriggerConditionsFromBundle(bundle);
-        BackgroundScheduler.backupSchedule(context, previousTriggerConditions, DEFER_START_SECONDS);
+        BackgroundScheduler.getInstance(context).backupSchedule(
+                previousTriggerConditions, DEFER_START_SECONDS);
 
         DeviceConditions currentConditions = OfflinePageUtils.getDeviceConditions(context);
         if (!currentConditions.isPowerConnected()
                 && currentConditions.getBatteryPercentage()
                         < previousTriggerConditions.getMinimumBatteryPercentage()) {
             Log.d(TAG, "Battery percentage is lower than minimum to start processing");
             return false;
         }
 
         if (SysUtils.isLowEndDevice() && ApplicationStatus.hasVisibleActivities()) {
@@ skipping 14 matching lines @@
             /** Callback releasing the wakelock once background work concludes. */
             @Override
             public void onResult(Boolean result) {
                 Log.d(TAG, "onProcessingDone");
                 // Release the wake lock.
                 waiter.onWaitDone();
             }
         };
     }
 }