Implementation of renotify flag for Notifications.

chrome/android/java/src/org/chromium/chrome/browser/notifications/StandardNotificationBuilder.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.notifications;
 
 import android.app.Notification;
 import android.content.Context;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationCompat.Action;
@@ skipping 23 matching lines @@
         builder.setDeleteIntent(mDeleteIntent);
         for (Action action : mActions) {
             builder.addAction(action);
         }
         if (mSettingsAction != null) {
             builder.addAction(mSettingsAction);
         }
         builder.setDefaults(mDefaults);
         builder.setVibrate(mVibratePattern);
         builder.setWhen(mTimestamp);
+        builder.setOnlyAlertOnce(!mRenotify);
         return builder.build();
     }
 }