Update the download summary icon

chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.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.app.Notification;
 import android.content.Context;
+import android.util.Pair;
 
 import org.chromium.base.BuildInfo;
 import org.chromium.base.ThreadUtils;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Callable;
 
 /**
  * Mock class to DownloadNotificationService for testing purpose.
@@ skipping 29 matching lines @@
         // Cancelling notifications here is synchronous, so we don't really have to worry about
         // {@code notificationIdToIgnore}, but address it properly anyway.
         if (mNotificationIds.size() == 1 && notificationIdToIgnore != null) {
             return !mNotificationIds.contains(notificationIdToIgnore);
         }
 
         return !mNotificationIds.isEmpty();
     }
 
     @Override
+    void updateSummaryIcon(
+            int removedNotificationId, Pair<Integer, Notification> addedNotification) {}
+
+    @Override
     void cancelSummaryNotification() {}
 
     @Override
     void updateNotification(int id, Notification notification) {
         if (!mNotificationIds.contains(id)) {
             mNotificationIds.add(id);
             mLastNotificationId = id;
         }
     }
 
@@ skipping 66 matching lines @@
     public void notifyDownloadCanceled(final String downloadGuid) {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
                 MockDownloadNotificationService.super.notifyDownloadCanceled(downloadGuid);
             }
         });
     }
 }