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

chrome/browser/resources/hotword/logging.js

Index: chrome/browser/resources/hotword/logging.js
diff --git a/chrome/browser/resources/hotword/logging.js b/chrome/browser/resources/hotword/logging.js
new file mode 100644
index 0000000000000000000000000000000000000000..9ab9a1240ba2e64e990003ed7c7fd1d98d2c05d1
--- /dev/null
+++ b/chrome/browser/resources/hotword/logging.js
@@ -0,0 +1,21 @@
+// 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
+  };
+});