[Android] BackgroundTaskScheduler reschedule implementation

components/background_task_scheduler/android/java/src/org/chromium/components/background_task_scheduler/BackgroundTaskGcmTaskService.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.components.background_task_scheduler;
 
 import com.google.android.gms.gcm.GcmNetworkManager;
 import com.google.android.gms.gcm.GcmTaskService;
 import com.google.android.gms.gcm.TaskParams;
 
@@ skipping 106 matching lines @@
                         ContextUtils.getApplicationContext(), taskParams));
             }
         });
 
         if (taskNeedsRescheduling.get()) return GcmNetworkManager.RESULT_RESCHEDULE;
 
         return GcmNetworkManager.RESULT_SUCCESS;
     }
 
     @Override
-    public void onInitializeTasks() {}
+    public void onInitializeTasks() {
+        BackgroundTaskSchedulerFactory.getScheduler().reschedule(
+                ContextUtils.getApplicationContext());
+    }
 }