Allow the Chrome Hangouts Test Extension to send feedback.

chrome/browser/resources/feedback/js/event_handler.js

 // 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.
 
 /**
  * @type {number}
  * @const
  */
 var FEEDBACK_WIDTH = 500;
 /**
@@ skipping 20 matching lines @@
   'ljoammodoonkhnehlncldjelhidljdpi', // GetHelp app.
   'ljacajndfccfgnfohlgkdphmbnpkjflk', // Chrome Remote Desktop Dev
   'gbchcmhmhahfdphkhkmpfmihenigjmpp', // Chrome Remote Desktop Stable
   'odkaodonbgfohohmklejpjiejmcipmib', // Chrome Remote Desktop QA
   'dokpleeekgeeiehdhmdkeimnkmoifgdd', // Chrome Remote Desktop QA backup
   'ajoainacpilcemgiakehflpbkbfipojk', // Chrome Remote Desktop Apps V2
   'llohocloplkbhgcfnplnoficdkiechcn', // Play Movies Dev
   'icljpnebmoleodmchaaajbkpoipfoahp', // Play Movies Nightly
   'mjekoljodoiapgkggnlmbecndfpbbcch', // Play Movies Beta
   'gdijeikdkaembjbdobgfkoidjkpbmlkd', // Play Movies Stable
+  'knipolnnllmklapflnccelgolnpehhpl', // Chrome Hangouts Extension

[rkc, 2014/07/24 20:37:42]

Nit: Hangouts Extension is fine. The Chrome is implied :)

 ];
 
 /**
  * Function to determine whether or not a given extension id is whitelisted to
  * invoke the feedback UI.
  * @param {string} id the id of the sender extension.
  * @return {boolean} Whether or not this sender is whitelisted.
  */
 function senderWhitelisted(id) {
   return id && whitelistedExtensionIds.indexOf(id) != -1;
@@ skipping 41 matching lines @@
       width: FEEDBACK_WIDTH,
       height: FEEDBACK_HEIGHT,
       hidden: true,
       resizable: false },
       function(appWindow) {});
 }
 
 chrome.runtime.onMessage.addListener(feedbackReadyHandler);
 chrome.runtime.onMessageExternal.addListener(requestFeedbackHandler);
 chrome.feedbackPrivate.onFeedbackRequested.addListener(startFeedbackUI);