Store distilled URL during distillation in Reading List on iOS

ios/chrome/browser/reading_list/url_downloader.h

Index: ios/chrome/browser/reading_list/url_downloader.h
diff --git a/ios/chrome/browser/reading_list/url_downloader.h b/ios/chrome/browser/reading_list/url_downloader.h
index 3ed0dc7426311a806220b7043c1782a18a9cfb2c..76a404ec156d9e147ec4085a04cb7a14d13052b9 100644
--- a/ios/chrome/browser/reading_list/url_downloader.h
+++ b/ios/chrome/browser/reading_list/url_downloader.h
@@ -54,6 +54,7 @@ class URLDownloader {
   // The path to downloaded file  and title should not be used in case of
   // failure.
   using DownloadCompletion = base::Callback<void(const GURL&,
+                                                 const GURL&,
                                                  SuccessState,
                                                  const base::FilePath&,
                                                  const std::string&)>;
@@ -131,6 +132,10 @@ class URLDownloader {
           images,
       const std::string& title);
 
+  // A callback called if the URL passed to the distilled leaded to a

[jif, 2017/01/20 10:23:19]

needs verification:
s/leaded/led/

[Olivier, 2017/01/20 10:47:07]

Done.

+  // redirection.
+  void RedirectionCallback(const GURL& page_url, const GURL& redirected_url);
+
   dom_distiller::DomDistillerService* distiller_service_;
   reading_list::ReadingListDistillerPageFactory* distiller_page_factory_;
   PrefService* pref_service_;
@@ -139,6 +144,7 @@ class URLDownloader {
   std::deque<Task> tasks_;
   bool working_;
   base::FilePath base_directory_;
+  GURL distilled_url_;
   std::unique_ptr<dom_distiller::DistillerViewerInterface> distiller_;
   base::CancelableTaskTracker task_tracker_;