Switch OfflinePages UMA to use currentTimeMillis, persist task

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundScheduler.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;

[dewittj, 2016/06/03 22:02:46]

nit: mention offline pages in CL description

[Pete Williamson, 2016/06/03 23:42:11]

Done.

 
 import android.content.Context;
 import android.os.Bundle;
-import android.os.SystemClock;
 
 import com.google.android.gms.gcm.GcmNetworkManager;
 import com.google.android.gms.gcm.OneoffTask;
 import com.google.android.gms.gcm.Task;
 
 import org.chromium.chrome.browser.ChromeBackgroundService;
 
 /**
  * The background scheduler class is for setting GCM Network Manager tasks.
  */
 public class BackgroundScheduler {
     /** Bundle key for the timestamp in milliseconds when the request started. */
     public static final String DATE_TAG = "Date";
     private static final long ONE_WEEK_IN_SECONDS = 60 * 60 * 24 * 7;
 
     /**
      * For the given Triggering conditions, start a new GCM Network Manager request.
      */
     public static void schedule(Context context) {
         // Get the GCM Network Scheduler.
         GcmNetworkManager gcmNetworkManager = GcmNetworkManager.getInstance(context);
 
         // TODO(petewil): Move the bundle packing and unpacking into a new SchedulerBridge
         // class which can be mocked, and calls the static BackgroundSchdeulerBridge.
         // TODO(petewil): Add the triggering conditions into the argument bundle.
         // Triggering conditions will include network state and charging requirements, maybe
         // also battery percentage.
         Bundle taskExtras = new Bundle();
-        taskExtras.putLong(DATE_TAG, SystemClock.elapsedRealtime());
+        taskExtras.putLong(DATE_TAG, System.currentTimeMillis());
 
         Task task = new OneoffTask.Builder()
                 .setService(ChromeBackgroundService.class)
                 .setExecutionWindow(0, ONE_WEEK_IN_SECONDS)
                 .setTag(OfflinePageUtils.TASK_TAG)
                 .setUpdateCurrent(true)
                 .setRequiredNetwork(Task.NETWORK_STATE_CONNECTED)
                 .setRequiresCharging(false)
                 .setExtras(taskExtras)
+                .setPersisted(true)
                 .build();
 
         gcmNetworkManager.schedule(task);
     }
 
     /**
      * Cancel any outstanding GCM Network Manager requests.
      */
     public static void unschedule(Context context) {
         // TODO(petewil): Take our task off the task queue.
     }
 }