Add support for providing an external file for extracting content.

components/dom_distiller/ios/distiller_page_ios.h

 // 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.
 
 #ifndef COMPONENTS_DOM_DISTILLER_IOS_DISTILLER_PAGE_IOS_H_
 #define COMPONENTS_DOM_DISTILLER_IOS_DISTILLER_PAGE_IOS_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 12 matching lines @@
 }
 
 namespace dom_distiller {
 
 class DistillerWebStateObserver;
 
 // Loads URLs and injects JavaScript into a page, extracting the distilled page
 // content.
 class DistillerPageIOS : public DistillerPage {
  public:
-  explicit DistillerPageIOS(web::BrowserState* browser_state);
+  DistillerPageIOS(web::BrowserState* browser_state,
+                   const std::string& distiller_js_script);
   ~DistillerPageIOS() override;
 
  private:
   friend class DistillerWebStateObserver;
 
   // DistillerPage implementation:
   void DistillPageImpl(const GURL& url, const std::string& script) override;
 
   // Called by |web_state_observer_| once the page has finished loading.
   void OnLoadURLDone(web::PageLoadCompletionStatus load_completion_status);
 
   // Called once the |script_| has been evaluated on the page.
   void HandleJavaScriptResultString(NSString* result);
 
   web::BrowserState* browser_state_;
   GURL url_;
   std::string script_;
   scoped_ptr<ios::WebControllerProvider> provider_;
   scoped_ptr<DistillerWebStateObserver> web_state_observer_;
   base::WeakPtrFactory<DistillerPageIOS> weak_ptr_factory_;
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_IOS_DISTILLER_PAGE_IOS_H_