Add a 'NaCl manager' to manage the state of the NaCl hotword detector plugin.

chrome/browser/resources/hotword/constants.js

+// Copyright (c) 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.constants', function() {
+'use strict';
+
+
+/**
+ * Hotword data shared module extension's id.

[James Hawkins, 2014/08/13 14:13:16]

s/id/ID/

[Anand Mistry (off Chromium), 2014/08/15 04:27:00]

Done.

+ * @const {string}
+ * TODO(amistry): Replace with real shared module ID.
+ */
+var SHARED_MODULE_ID = 'bepbmhgboaologfdajaanbcjmnhjmhfn';
+
+
+/**
+ * Path to shared module data.
+ * @const {string}
+ */
+var SHARED_MODULE_ROOT = '_modules/' + SHARED_MODULE_ID;

[rpetterson, 2014/08/15 00:41:57]

Is module a specific type of extension that we're going to be switching to? Or
is this terminology from the external component extension?

[Anand Mistry (off Chromium), 2014/08/15 04:27:00]

A "shared module" is a type of extension that provides data to another
extension, and doesn't function by itself. In our case, it will provide the
NEXEs and language models. A more public example is the cast API:
http://www.chromestory.com/2014/08/chromecast-becomes-first-chrome-shared-mod...

An example of usage can be seen in
https://src.chromium.org/viewvc/chrome/trunk/src/chrome/test/data/extensions/...

+
+
+/**
+ * Time to wait for expected messages, in milliseconds.
+ * @enum {number}
+ */
+var Timeout = {

[James Hawkins, 2014/08/13 14:13:16]

The var name should have the unit of time in it.  I suggest TimeoutMs.

[Anand Mistry (off Chromium), 2014/08/15 04:27:00]

Done.

+  SHORT: 200,
+  NORMAL: 500,
+  LONG: 2000
+};
+
+
+/**
+ * The URL of the files used by the plugin.
+ * @enum {string}
+ */
+var File = {
+  RECOGNIZER_CONFIG: 'hotword.data',
+};
+
+
+/**
+ * Errors emitted by the NaClManager.
+ * @enum {string}
+ */
+var Error = {
+  NACL_CRASH: 'nacl_crash',
+  TIMEOUT: 'timeout',
+};
+
+
+/**
+ * Event types supported by NaClManager.
+ * @enum {string}
+ */
+var Event = {
+  READY: 'ready',
+  TRIGGER: 'trigger',
+  ERROR: 'error',
+};
+
+
+/**
+ * Messages for communicating with the NaCl recognizer plugin. These must match
+ * constants in <google3>/hotword_plugin.c
+ * @enum {string}
+ */
+var NaClPlugin = {
+  RESTART: 'r',
+  SAMPLE_RATE_PREFIX: 'h',
+  MODEL_PREFIX: 'm',
+  STOP: 's',
+  REQUEST_MODEL: 'model',
+  MODEL_LOADED: 'model_loaded',
+  READY_FOR_AUDIO: 'audio',
+  STOPPED: 'stopped',
+  HOTWORD_DETECTED: 'hotword',
+  MS_CONFIGURED: 'ms_configured'
+};
+
+
+/**
+ * The browser UI language.
+ * @const {string}
+ */
+var UI_LANGUAGE = (chrome.i18n && chrome.i18n.getUILanguage) ?
+      chrome.i18n.getUILanguage() : '';
+
+return {
+  SHARED_MODULE_ID: SHARED_MODULE_ID,
+  SHARED_MODULE_ROOT: SHARED_MODULE_ROOT,
+  Timeout: Timeout,
+  File: File,
+  Error: Error,
+  Event: Event,
+  NaClPlugin: NaClPlugin,
+  UI_LANGUAGE: UI_LANGUAGE
+};
+
+});