Split out non-auto-generatable externs from auto generated ones.

chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js

 // 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.
 
 /**
  * @fileoverview Implements support for live regions in ChromeVox Next.
  */
 
 goog.provide('LiveRegions');
 
 goog.require('ChromeVoxState');
 
 goog.scope(function() {
 var AutomationNode = chrome.automation.AutomationNode;
 var RoleType = chrome.automation.RoleType;
 var TreeChange = chrome.automation.TreeChange;
+var TreeChangeObserverFilter = chrome.automation.TreeChangeObserverFilter;
 
 /**
  * ChromeVox2 live region handler.
  * @param {!ChromeVoxState} chromeVoxState The ChromeVox state object,
  *     keeping track of the current mode and current range.
  * @constructor
  */
 LiveRegions = function(chromeVoxState) {
   /**
    * @type {!ChromeVoxState}
    * @private
    */
   this.chromeVoxState_ = chromeVoxState;
 
   /**
    * The time the last live region event was output.
    * @type {!Date}
    * @private
    */
   this.lastLiveRegionTime_ = new Date(0);
 
   /**
    * Set of nodes that have been announced as part of a live region since
    *     |this.lastLiveRegionTime_|, to prevent duplicate announcements.
    * @type {!WeakSet<AutomationNode>}
    * @private
    */
   this.liveRegionNodeSet_ = new WeakSet();
+
   chrome.automation.addTreeChangeObserver(
-      'liveRegionTreeChanges', this.onTreeChange.bind(this));
+      TreeChangeObserverFilter.LIVE_REGION_TREE_CHANGES,
+      this.onTreeChange.bind(this));
 };
 
 /**
  * Live region events received in fewer than this many milliseconds will
  * queue, otherwise they'll be output with a category flush.
  * @type {number}
  * @const
  */
 LiveRegions.LIVE_REGION_QUEUE_TIME_MS = 5000;
 
@@ skipping 123 matching lines @@
       parent = parent.parent;
     }
 
     this.liveRegionNodeSet_.add(node);
     output.go();
     this.lastLiveRegionTime_ = currentTime;
   },
 };
 
 });  // goog.scope