Introduce a new 'all_frames' property to content scripts and

chrome/test/data/extensions/subscribe_page_action/feed_finder.js

 // Copyright (c) 2009 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.
 
-if (window == top) {
-  findFeeds();
-  window.addEventListener("focus", findFeeds);
-}
+findFeeds();
+window.addEventListener("focus", findFeeds);
 
 function findFeeds() {
   // Find all the RSS link elements.
   var result = document.evaluate(
       '//link[@rel="alternate"][contains(@type, "rss") or ' +
       'contains(@type, "atom") or contains(@type, "rdf")]',
       document, null, 0, null);
 
   var feeds = [];
   var item;
   while (item = result.iterateNext())
     feeds.push(item.href);
 
   // Notify the extension of the feed URLs we found.
   chrome.extension.connect().postMessage(feeds);
 }