Adds a Training Manager to the hotword extension.

chrome/browser/resources/hotword/training_manager.js

Index: chrome/browser/resources/hotword/training_manager.js
diff --git a/chrome/browser/resources/hotword/always_on_manager.js b/chrome/browser/resources/hotword/training_manager.js
similarity index 59%
copy from chrome/browser/resources/hotword/always_on_manager.js
copy to chrome/browser/resources/hotword/training_manager.js
index c656c9ce86c2e003b2ac60d8c9da6bd0c54a71dc..9130e2d02492c7c71ae3c6761e83043f33925003 100644
--- a/chrome/browser/resources/hotword/always_on_manager.js
+++ b/chrome/browser/resources/hotword/training_manager.js
@@ -6,25 +6,25 @@ 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 */
@@ -32,10 +32,18 @@ cr.define('hotword', 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
   };
 });