[Android] BackgroundTaskScheduler reschedule implementation

chrome/android/java/src/org/chromium/chrome/browser/services/gcm/GCMBackgroundTask.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.services.gcm;
 
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.os.Build;
 import android.os.Bundle;
@@ skipping 37 matching lines @@
      * Called when the system has determined that processing the GCM message must be stopped.
      *
      * @return Boolean indicating whether the task has to be rescheduled.
      */
     @MainThread
     @Override
     public boolean onStopTask(Context context, TaskParameters taskParameters) {
         // The GCM Driver has no mechanism for aborting previously dispatched messages.
         return false;
     }
+
+    @MainThread
+    @Override
+    public void reschedule(Context context) {
+        // Needs appropriate implementation.
+    }
 }