Chrome Extension IME sample error
<p>I am attempting to learn how to build a Chrome extension.  So this question has as much to do with that process, as the code itself.</p>

<p>I downloaded the sample code from here: <a href="https://developer.chrome.com/extensions/samples#search:.ime" rel="nofollow">https://developer.chrome.com/extensions/samples#search:.ime</a> (code below)</p>

<p>Then I browsed to chrome://extensions, enabled developer mode, and clicked load unpacked extension - and selected the directory with the below 2 files.</p>

<p>Loading the extension reports an error on line 9 of main.js (console.log("Initializing IME");) "anonymous function".</p>

<ol>
<li><strong>Why does the code produce an error?</strong></li>
<li><p><strong>Did I load the extension correctly?</strong>  (it doesn't appear to be activated, possibly due to the error?)</p></li>
<li><p>I can resolve the error by commenting out the offending line, but the extension still appears not to be activated.  <strong>How do I activate it?</strong>  (am I missing something?)</p></li>
</ol>

<p>manifest.json:</p>

<pre><code>{
 "name": "Test IME",
 "version": "1.0",
 "manifest_version": 2,
 "description": "A simple IME that converts all keystrokes to upper case.",
 "background":  {
   "scripts": ["main.js"]
 }, 
 "permissions": [
   "input"
 ],
 "input_components": [
   {
     "name": "Test IME",
     "type": "ime",
     "id": "test",
     "description": "Test IME",  // A user visible description
     "language": "en-US",  // The primary language this IME is used for
     "layouts": ["us::eng"]  // The supported keyboard layouts for this IME
   }
 ] 
}
</code></pre>

<p>main.js:</p>

<pre><code>// Copyright 2013 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.

var ime_api = chrome.input.ime;

var context_id = -1;

console.log("Initializing IME");

ime_api.onFocus.addListener(function(context) {
  console.log('onFocus:' + context.contextID);
  context_id = context.contextID;
});
ime_api.onBlur.addListener(function(contextID) {
  console.log('onBlur:' + contextID);
  context_id = -1;
});

ime_api.onActivate.addListener(function(engineID) {
  console.log('onActivate:' + engineID);
});
ime_api.onDeactivated.addListener(function(engineID) {
  console.log('onDeactivated:' + engineID);
});

ime_api.onKeyEvent.addListener(
function(engineID, keyData) {
  console.log('onKeyEvent:' + keyData.key + " context: " + context_id);
  if (keyData.type == "keydown" &amp;&amp; keyData.key.match(/^[a-z]$/)) {
    chrome.input.ime.commitText({"contextID": context_id,
                                 "text": keyData.key.toUpperCase()});
    return true;
  }

  return false
});
</code></pre>