Adds a Training Manager to the hotword extension.

chrome/browser/resources/hotword/training_manager.js

 // 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.
 
 cr.define('hotword', function() {
   'use strict';
 
   /**
-   * Class used to manage always-on hotwording. Automatically starts hotwording
-   * on startup, if always-on is enabled, and starts/stops hotwording at
-   * appropriate times.
+   * Class used to manage speaker training. Starts a hotwording session
+   * if training is on, and automatically restarts the detector when a
+   * a hotword is triggered.
    * @param {!hotword.StateManager} stateManager
    * @constructor
    * @extends {hotword.BaseSessionManager}
    */
-  function AlwaysOnManager(stateManager) {
+  function TrainingManager(stateManager) {
     hotword.BaseSessionManager.call(this,
                                     stateManager,
-                                    hotword.constants.SessionSource.ALWAYS);
+                                    hotword.constants.SessionSource.TRAINING);
   }
 
-  AlwaysOnManager.prototype = {
+  TrainingManager.prototype = {
     __proto__: hotword.BaseSessionManager.prototype,
 
     /** @override */
      enabled: function() {
-       return this.stateManager.isAlwaysOnEnabled();
+       return this.stateManager.isTrainingEnabled();
      },
 
     /** @override */
     updateListeners: function() {
       hotword.BaseSessionManager.prototype.updateListeners.call(this);
       if (this.enabled())
         this.startSession_();
+    },
+
+    /** @override */
+    handleHotwordTrigger: function() {
+      if (this.enabled()) {
+        hotword.BaseSessionManager.prototype.handleHotwordTrigger.call(this);
+        this.startSession_();
+      }
     }
   };
 
   return {
-    AlwaysOnManager: AlwaysOnManager
+    TrainingManager: TrainingManager
   };
 });