Upstream iOS implementation of dom_distiller

components/dom_distiller/ios/javascript/domdistiller.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.
+
+// Applies DomDistillerJs to the content of the page and returns a
+// DomDistillerResults (as a javascript object/dict).
+(function() {
+  try {
+    // UIWebView's JavaScript engine has a bug that causes crashes when creating
+    // a separate window object (as in the non-iOS version of this file), so
+    // allow the script to run directly in the window until a better solution
+    // is created.
+    // TODO(kkhorimoto): investigate whether this is necessary for WKWebView.
+    <include
+    src="../../../../third_party/dom_distiller_js/package/js/domdistiller.js"/>
+    // UIWebView requires javascript to return a single string value.
+    return JSON.stringify(
+        window.com.dom_distiller.DomDistiller.applyWithOptions($$OPTIONS));
+  } catch (e) {
+    window.console.error("Error during distillation: " + e);
+    if (e.stack != undefined) window.console.error(e.stack);
+  }
+  return undefined;
+})();