add pause button for resumable in-progress downloads.

chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java

 // Copyright 2015 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.download;
 
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.IBinder;
@@ skipping 80 matching lines @@
 
     /**
      * Tests adding and cancelling notifications.
      */
     @SmallTest
     @Feature({"Download"})
     public void testAddingAndCancelingNotifications() {
         setupService();
         startNotificationService();
         DownloadNotificationService service = bindNotificationService();
-        service.notifyDownloadProgress(1, "test", -1, 1L, 1L);
+        service.notifyDownloadProgress(1, "test", -1, 1L, 1L, true);
         assertEquals(1, getService().getNotificationIds().size());
         assertTrue(getService().getNotificationIds().contains(1));
 
         service.notifyDownloadSuccessful(2, "test2", null);
         assertEquals(2, getService().getNotificationIds().size());
         assertTrue(getService().getNotificationIds().contains(2));
 
         service.notifyDownloadFailed(3, "test3");
         assertEquals(3, getService().getNotificationIds().size());
         assertTrue(getService().getNotificationIds().contains(3));
 
         service.cancelNotification(1);
         assertEquals(2, getService().getNotificationIds().size());
         assertFalse(!getService().getNotificationIds().contains(1));
     }
 }