Show an extension info bubble when a script badge is clicked.

chrome/browser/resources/extensions/extension_info.js

+// Copyright (c) 2012 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('extension_info', function() {
+  'use strict';
+
+  /**
+   * Object for accessing localized strings.
+   * @type {!LocalStrings}
+   */
+  function load() {
+    var extensionId = location.pathname.substr(1);
+    if (extensionId)
+      chrome.send('requestExtensionInfo', [extensionId]);
+  }
+
+  function handleExtensionInfo(extension) {
+    $('extension-item').style.backgroundImage = 'url(' + extension.icon + ')';
+    $('extension-title-running').textContent =
+        loadTimeData.getStringF('isRunning', extension.name);
+    $('extension-update-time').textContent = extension.install_time;
+    $('extension-description').textContent = extension.description;
+  }
+
+  return {
+    load: load,
+    handleExtensionInfo: handleExtensionInfo
+  };
+});
+
+window.addEventListener('DOMContentLoaded', extension_info.load);