Get signals working in the EXTRA_DATA section of MHTML

chrome/browser/android/offline_pages/prerendering_offliner.cc

Index: chrome/browser/android/offline_pages/prerendering_offliner.cc
diff --git a/chrome/browser/android/offline_pages/prerendering_offliner.cc b/chrome/browser/android/offline_pages/prerendering_offliner.cc
index 31c0813bdb86721bd1922114781bf64ee9d8547a..1f40fe491ceae05f38545248fdfb472d6d75aaf5 100644
--- a/chrome/browser/android/offline_pages/prerendering_offliner.cc
+++ b/chrome/browser/android/offline_pages/prerendering_offliner.cc
@@ -70,7 +70,7 @@ void PrerenderingOffliner::OnLoadPageDone(
     if (save_page_params.url != request.url())
       save_page_params.original_url = request.url();
 
-    SavePage(save_page_params, std::move(archiver),
+    SavePage(save_page_params, std::move(archiver), loader_->GetSignalData(),
              base::Bind(&PrerenderingOffliner::OnSavePageDone,
                         weak_ptr_factory_.GetWeakPtr(), request));
   } else {
@@ -218,10 +218,11 @@ void PrerenderingOffliner::SetApplicationStateForTesting(
 void PrerenderingOffliner::SavePage(
     const OfflinePageModel::SavePageParams& save_page_params,
     std::unique_ptr<OfflinePageArchiver> archiver,
+    const std::vector<std::string>& signal_data,
     const SavePageCallback& save_callback) {
   DCHECK(offline_page_model_);
   offline_page_model_->SavePage(
-      save_page_params, std::move(archiver), save_callback);
+      save_page_params, std::move(archiver), signal_data, save_callback);
 }
 
 PrerenderingLoader* PrerenderingOffliner::GetOrCreateLoader() {