Add a trivial logging wrapper around console.log, and add some useful log

messages.

BUG=397019

Review URL: https://codereview.chromium.org/601123002

Cr-Commit-Position: refs/heads/master@{#297366}

chrome/browser/resources/component_extension_resources.grd

@@ -85,6 +85,7 @@
 
         <!-- (Experimental) hotword triggering extension -->
         <include name="IDR_HOTWORD_CONSTANTS_JS" file="hotword/constants.js" type="BINDATA" />
+        <include name="IDR_HOTWORD_LOGGING_JS" file="hotword/logging.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" />
         <include name="IDR_HOTWORD_STATE_MANAGER_JS" file="hotword/state_manager.js" type="BINDATA" />

chrome/browser/resources/hotword/logging.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';
+
+  /**
+   * Wrapper around console.log allowing debug log message to be enabled during
+   * development.
+   */
+  function debug() {
+    if (hotword.DEBUG || window.localStorage['hotword.DEBUG'])
+      console.log.apply(console, arguments);
+  }
+
+  return {
+    DEBUG: false,
+    debug: debug
+  };
+});

chrome/browser/resources/hotword/manager.js

@@ -33,12 +33,15 @@
   // 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)
+    if (info.id == hotword.constants.SHARED_MODULE_ID) {
+      hotword.debug('Shared module installed, reloading extension.');
       chrome.runtime.reload();
+    }
   });
 
   // Detect when a session has requested to be started and stopped.
   chrome.hotwordPrivate.onHotwordSessionRequested.addListener(function() {
+    hotword.debug('hotwordPrivate.onHotwordSessionRequested');
     // 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
@@ -51,6 +54,7 @@
   });
 
   chrome.hotwordPrivate.onHotwordSessionStopped.addListener(function() {
+    hotword.debug('hotwordPrivate.onHotwordSessionStopped');
     stateManager.stopSession(hotword.constants.SessionSource.LAUNCHER);
     chrome.hotwordPrivate.setHotwordSessionState(false, function() {});
   });

chrome/browser/resources/hotword/manifest.json

@@ -12,6 +12,7 @@
       "chrome://resources/js/util.js",
       "chrome://resources/js/cr/event_target.js",
       "constants.js",
+      "logging.js",
       "nacl_manager.js",
       "state_manager.js",
       "manager.js"

chrome/browser/resources/hotword/state_manager.js

@@ -86,6 +86,7 @@ cr.define('hotword', function() {
      * @private
      */
     handleStatus_: function(status) {
+      hotword.debug('New hotword status', status);
       this.hotwordStatus_ = status;
       this.updateStateFromStatus_();
     },
@@ -234,6 +235,7 @@ cr.define('hotword', function() {
      * @private
      */
     onTrigger_: function() {
+      hotword.debug('Hotword triggered!');
       assert(this.pluginManager_);
       // Detector implicitly stops when the hotword is detected.
       this.state_ = State_.STOPPED;
@@ -257,6 +259,7 @@ cr.define('hotword', function() {
      *     been started successfully.
      */
     startSession: function(source, startedCb) {
+      hotword.debug('Starting session for source: ' + source);
       this.sessionSource_ = source;
       this.sessionStartedCb_ = startedCb;
       this.updateStateFromStatus_();
@@ -268,6 +271,7 @@ cr.define('hotword', function() {
      *     session request.
      */
     stopSession: function(source) {
+      hotword.debug('Stopping session for source: ' + source);
       this.sessionSource_ = null;
       this.sessionStartedCb_ = null;
       this.updateStateFromStatus_();