Track original URL when downloading a redirected page

chrome/browser/android/offline_pages/background_loader_offliner.cc

Index: chrome/browser/android/offline_pages/background_loader_offliner.cc
diff --git a/chrome/browser/android/offline_pages/background_loader_offliner.cc b/chrome/browser/android/offline_pages/background_loader_offliner.cc
index 34459c72c7fb8881d4fc6cf22b8f23d437c32a92..e1a2be86f4d010fde82f9a2fe44c52f7a7522348 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner.cc
+++ b/chrome/browser/android/offline_pages/background_loader_offliner.cc
@@ -162,7 +162,9 @@ void BackgroundLoaderOffliner::DidStopLoading() {
 
   // Pass in the original URL if it's different from last committed
   // when redirects occur.
-  if (params.url != request.url())
+  if (!request.original_url().is_empty())
+    params.original_url = request.original_url();
+  else if (params.url != request.url())
     params.original_url = request.url();
 
   offline_page_model_->SavePage(