[Android] BackgroundTaskScheduler reschedule implementation

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

 // Copyright 2017 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 org.chromium.base.Callback;
 import org.chromium.base.Log;
@@ skipping 29 matching lines @@
 
         return BackgroundOfflinerTask.startBackgroundRequestsImpl(
                 mBackgroundProcessor, context, taskParameters.getExtras(), wrapCallback(callback));
     }
 
     @Override
     public boolean onStopTask(Context context, TaskParameters taskParameters) {
         return mBackgroundProcessor.stopScheduledProcessing();
     }
 
+    @Override
+    public void reschedule(Context context) {
+        BackgroundScheduler.getInstance(context).rescheduleOfflinePagesTasksOnUpgrade();
+    }
+
     /** Wraps the callback for code reuse */
     private Callback<Boolean> wrapCallback(final TaskFinishedCallback callback) {
         return new Callback<Boolean>() {
             @Override
             public void onResult(Boolean result) {
                 callback.taskFinished(result);
             }
         };
     }
 
     private static void launchBrowserIfNecessary(Context context) {
         if (BrowserStartupController.get(LibraryProcessType.PROCESS_BROWSER)
                         .isStartupSuccessfullyCompleted()) {
             return;
         }
 
         // TODO(fgorski): This method is taken from ChromeBackgroundService as a local fix and will
         // be removed with BackgroundTaskScheduler supporting GcmNetworkManager scheduling.
         try {
             ChromeBrowserInitializer.getInstance(context).handleSynchronousStartup();
         } catch (ProcessInitException e) {
             Log.e(TAG, "ProcessInitException while starting the browser process.");
             // Since the library failed to initialize nothing in the application can work, so kill
             // the whole application not just the activity.
             System.exit(-1);
         }
     }
 }