Add support for providing an external file for extracting content.

components/dom_distiller/ios/distiller_page_factory_ios.mm

 // Copyright 2015 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.
 
 #include "components/dom_distiller/ios/distiller_page_factory_ios.h"
 
 #include "components/dom_distiller/ios/distiller_page_ios.h"
 #include "ios/web/public/browser_state.h"
 
 namespace dom_distiller {
 
 DistillerPageFactoryIOS::DistillerPageFactoryIOS(
-    web::BrowserState* browser_state)
-    : browser_state_(browser_state) {
+    web::BrowserState* browser_state,
+    const std::string& distiller_js_script)
+    : browser_state_(browser_state), distiller_js_script_(distiller_js_script) {
 }
 
 scoped_ptr<DistillerPage> DistillerPageFactoryIOS::CreateDistillerPage(
     const gfx::Size& view_size) const {
-  return make_scoped_ptr<DistillerPage>(new DistillerPageIOS(browser_state_));
+  return make_scoped_ptr<DistillerPage>(
+      new DistillerPageIOS(browser_state_, distiller_js_script_));
 }
 
 scoped_ptr<DistillerPage>
 DistillerPageFactoryIOS::CreateDistillerPageWithHandle(
     scoped_ptr<SourcePageHandle> handle) const {
-  return make_scoped_ptr<DistillerPage>(new DistillerPageIOS(browser_state_));
+  return make_scoped_ptr<DistillerPage>(
+      new DistillerPageIOS(browser_state_, distiller_js_script_));
 }
 
 }  // namespace dom_distiller