Handle notification preferences intent from gear icon.

chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationConstants.java

 // Copyright 2014 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;
 
 /**
  * Constants used in more than a single Notification class, e.g. intents and extra names.
  */
 public class NotificationConstants {
     // These actions have to be synchronized with the receiver defined in AndroidManifest.xml.
     public static final String ACTION_CLICK_NOTIFICATION =
             "org.chromium.chrome.browser.notifications.CLICK_NOTIFICATION";
     public static final String ACTION_CLOSE_NOTIFICATION =
             "org.chromium.chrome.browser.notifications.CLOSE_NOTIFICATION";
 
     public static final String EXTRA_NOTIFICATION_ID = "notification_id";
+    public static final String EXTRA_NOTIFICATION_TAG = "notification_tag";
 
     // TODO(peter): Remove these extras once Notifications are powered by a database on the
     // native side, that contains all the additional information.
     public static final String EXTRA_NOTIFICATION_PLATFORM_ID = "notification_platform_id";
     public static final String EXTRA_NOTIFICATION_DATA = "notification_data";
 
     /**
      * Unique identifier for a single sync notification. Since the notification ID is reused,
      * old notifications will be overwritten.
      */
     public static final int NOTIFICATION_ID_SYNC = 1;
     /**
      * Unique identifier for the "Signed in to Chrome" notification.
      */
     public static final int NOTIFICATION_ID_SIGNED_IN = 2;
+
+    /**
+     * Separator used to separate the notification origin from additional data such as the
+     * developer specified tag.
+     */
+    public static final String NOTIFICATION_TAG_SEPARATOR = ";";
 }