[Android] BackgroundTaskScheduler reschedule implementation

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/prefetch/PrefetchBackgroundTask.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.prefetch;
 
 import android.content.Context;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
@@ skipping 97 matching lines @@
     }
 
     @Override
     public boolean onStopTask(Context context, TaskParameters taskParameters) {
         assert taskParameters.getTaskId() == TaskIds.OFFLINE_PAGES_PREFETCH_JOB_ID;
         if (mNativeTask == 0) return false;
 
         return nativeOnStopTask(mNativeTask);
     }
 
+    @Override
+    public void reschedule(Context context) {}
+
     /**
      * Called during construction of the native task.
      *
      * PrefetchBackgroundTask#onStartTask constructs the native task.
      */
     @VisibleForTesting
     @CalledByNative
     void setNativeTask(long nativeTask) {
         mNativeTask = nativeTask;
     }
@@ skipping 27 matching lines @@
             // the whole application not just the activity.
             System.exit(-1);
         }
     }
 
     @VisibleForTesting
     native boolean nativeStartPrefetchTask(Profile profile);
     @VisibleForTesting
     native boolean nativeOnStopTask(long nativePrefetchBackgroundTask);
 }