Support for distilling prior pages in an article.

third_party/readability/js/readability.js

 // Copyright 2014 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.
 
 // Local modifications to this file are described in the README.chromium
 // file.
 
 var dbg = (typeof console !== 'undefined') ? function(s) {
     console.log("Readability: " + s);
 } : function() {};
@@ skipping 1726 matching lines @@
     }
 };
 
 // Extracts long-form content from a page and returns and array where the first
 // element is the article title, the second element is HTML containing the
 // long-form content, and remaining elements are URLs for images referenced by
 // that HTML. Each <img> tag in the HTML has an id field set to k - 2, which
 // corresponds to a URL listed at index k in the array returned.
 (function () {
     readability.init();
-    var result = new Array(3);
+    var result = new Array(4);
     result[0] = readability.getArticleTitle();
     result[1] = readability.getDistilledArticleHTML();
     result[2] = readability.getNextPageLink();
+    // TODO(shashishekhar): Add actual previous page link here.
+    result[3] = '';
     return result.concat(readability.getImages());
 }())