Allow the Chrome Hangouts Test Extension to send feedback.

BUG=397242

Review URL: https://codereview.chromium.org/419603002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285457 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -38,6 +38,7 @@ var whitelistedExtensionIds = [
   'icljpnebmoleodmchaaajbkpoipfoahp', // Play Movies Nightly
   'mjekoljodoiapgkggnlmbecndfpbbcch', // Play Movies Beta
   'gdijeikdkaembjbdobgfkoidjkpbmlkd', // Play Movies Stable
+  'knipolnnllmklapflnccelgolnpehhpl', // Hangouts Extension
 ];
 
 /**