Pass more information by argument to the dom_distiller script.

components/dom_distiller/core/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() {
+(function(options, stringify_output, use_new_context) {
   try {
     // The generated domdistiller.js accesses the window object only explicitly
     // via the window name. So, we create a new object with the normal window
     // object as its prototype and initialize the domdistiller.js with that new
     // context so that it doesn't change the real window object.
     function initialize(window) {
       // This include will be processed at build time by grit.
       <include src="../../../../third_party/dom_distiller_js/package/js/domdistiller.js"/>
     }
-    <if expr="is_ios">
-      // UIWebView's JavaScript engine has a bug that causes crashes when
-      // creating a separate window object, 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.
-      var context = window;
-    </if>
-    <if expr="not is_ios">
-      var context = Object.create(window);
-    </if>
+    var context = use_new_context ? Object.create(window) : window
     context.setTimeout = function() {};
     context.clearTimeout = function() {};
     initialize(context);
 
     // The OPTIONS placeholder will be replaced with the DomDistillerOptions at
     // runtime.
     var distiller = context.org.chromium.distiller.DomDistiller;
-    var res = distiller.applyWithOptions($$OPTIONS);
-  <if expr="is_ios">
-    // UIWebView requires javascript to return a single string value.
-    return JSON.stringify(res);
-  </if>
-  <if expr="not is_ios">
+    var res = distiller.applyWithOptions(options);
+
+    if (stringify_output) {
+      return JSON.stringify(res);
+    }
     return res;
-  </if>
   } catch (e) {
     window.console.error("Error during distillation: " + e);
     if (e.stack != undefined) window.console.error(e.stack);
   }
   return undefined;
-})()
+})(options = $$OPTIONS,
+   stringify_output = $$STRINGIFY,
+   use_new_context = $$NEW_CONTEXT)