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

Based on the hotword extension, but heavily modified.

BUG=397019

Review URL: https://codereview.chromium.org/464213002

Cr-Commit-Position: refs/heads/master@{#291597}

chrome/browser/resources/component_extension_resources.grd

@@ -64,7 +64,9 @@
         <include name="IDR_HOTWORD_HELPER_MANAGER_JS" file="hotword_helper/manager.js" type="BINDATA" />
 
         <!-- (Experimental) hotword triggering extension -->
+        <include name="IDR_HOTWORD_CONSTANTS_JS" file="hotword/constants.js" type="BINDATA" />
         <include name="IDR_HOTWORD_MANAGER_JS" file="hotword/manager.js" type="BINDATA" />
+        <include name="IDR_HOTWORD_NACL_MANAGER_JS" file="hotword/nacl_manager.js" type="BINDATA" />
       </if>
       <if expr="not is_android">
         <include name="IDR_FEEDBACK_DEFAULT_HTML" file="feedback/html/default.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />

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.
+ * @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;
+
+
+/**
+ * Time to wait for expected messages, in milliseconds.
+ * @enum {number}
+ */
+var TimeoutMs = {
+  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,
+  TimeoutMs: TimeoutMs,
+  File: File,
+  Error: Error,
+  Event: Event,
+  NaClPlugin: NaClPlugin,
+  UI_LANGUAGE: UI_LANGUAGE
+};
+
+});

chrome/browser/resources/hotword/manifest.json

@@ -7,13 +7,21 @@
   "manifest_version": 2,
 
   "background": {
-    "scripts": ["manager.js"],
+    "scripts": [
+      "chrome://resources/js/cr.js",
+      "chrome://resources/js/util.js",
+      "chrome://resources/js/cr/event_target.js",
+      "constants.js",
+      "nacl_manager.js",
+      "manager.js"
+    ],
     "persistent": false
   },
 
   "permissions": [
     "*://*.google.com/*",
     "chrome://newtab/",
+    "chrome://resources/",
     "hotwordPrivate",
     "tabs"
   ],