Add a StateManager for managing hotwording state based on various factors

chrome/browser/resources/hotword/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.
 

[Dan Beam, 2014/08/27 20:08:36]

(function() {

[Anand Mistry (off Chromium), 2014/08/28 00:59:25]

Done. But as a JS noob, why? Is it avoid leaking variables into the 'global'
scope?

[Dan Beam, 2014/09/03 19:08:19]

http://jslinterrors.com/use-the-function-form-of-use-strict

 'use strict';
 
 /**
  * @fileoverview This extension provides hotword triggering capabilites to
  * Chrome.
  *
  * This extension contains all the JavaScript for loading and managing the
  * hotword detector. The hotword detector and language model data will be
  * provided by a shared module loaded from the web store.
+ *
+ * IMPORTANT! Whenever adding new events, the extension version number MUST be
+ * incremented.
  */
 
+// Hotwording state.
+var stateManager = new hotword.StateManager();
+
+// Detect Chrome startup and make sure we get a chance to run.
+chrome.runtime.onStartup.addListener(function() {
+  stateManager.updateStatus();
+});
+
+// Detect when hotword settings have changed.
+chrome.hotwordPrivate.onEnabledChanged.addListener(function() {
+  stateManager.updateStatus();
+});
+
+// Detect when the shared module containing the NaCL module and language model
+// is installed.
+chrome.management.onInstalled.addListener(function(info) {
+  if (info.id == hotword.constants.SHARED_MODULE_ID) {

[Dan Beam, 2014/08/27 20:08:36]

no curlies

[Anand Mistry (off Chromium), 2014/08/28 00:59:25]

Done.

+    chrome.runtime.reload();
+  }
+});
+
+// Detect when a session has requested to be started and stopped.
+chrome.hotwordPrivate.onHotwordSessionRequested.addListener(function() {
+  // TODO(amistry): This event should change state depending on whether the user
+  // has enabled always-on hotwording. But for now, always signal the start of a
+  // hotwording session. This allows this extension to work with the app
+  // launcher in the current state.
+  chrome.hotwordPrivate.setHotwordSessionState(true, function() {});
+});
+
+chrome.hotwordPrivate.onHotwordSessionStopped.addListener(function() {
+  chrome.hotwordPrivate.setHotwordSessionState(false, function() {});
+});
+

[Dan Beam, 2014/08/27 20:08:36]

}());

[Anand Mistry (off Chromium), 2014/08/28 00:59:25]

Done.