[Omaha] Move most functionality to OmahaBase, add JobService

components/background_task_scheduler/android/java/src/org/chromium/components/background_task_scheduler/TaskIds.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;
 
 /**
  * This class lists all the unique task IDs used around in Chromium. These are listed here to ensure
  * that there is no overlap of task IDs between different users of the BackgroundTaskScheduler.
  */
 public final class TaskIds {
     public static final int TEST = 0x00008378;
+    public static final int OMAHA_JOB_ID = 0x00011684;
 
     public static final int GCM_BACKGROUND_TASK_JOB_ID = 1;
     public static final int NOTIFICATION_SERVICE_JOB_ID = 21;
 
     private TaskIds() {}
 }