Refactors offline page tab helper to stash the offline page item on redirect.

chrome/browser/android/offline_pages/offline_page_utils.cc

Index: chrome/browser/android/offline_pages/offline_page_utils.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_utils.cc b/chrome/browser/android/offline_pages/offline_page_utils.cc
index a7635af37df7767edf5f721e30ea3fa89d7c7215..82f5ff7dac3df53f1214c553f30a50effadaff27 100644
--- a/chrome/browser/android/offline_pages/offline_page_utils.cc
+++ b/chrome/browser/android/offline_pages/offline_page_utils.cc
@@ -12,10 +12,12 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/android/offline_pages/offline_page_mhtml_archiver.h"
 #include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
+#include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
 #include "components/offline_pages/offline_page_feature.h"
 #include "components/offline_pages/offline_page_item.h"
 #include "components/offline_pages/offline_page_model.h"
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/web_contents.h"
 #include "url/gurl.h"
 
 namespace offline_pages {
@@ -167,4 +169,11 @@ void OfflinePageUtils::MarkPageAccessed(
   offline_page_model->MarkPageAccessed(offline_page->offline_id);
 }
 
+const OfflinePageItem* OfflinePageUtils::GetOfflinePageFromWebContents(
+    content::WebContents* web_contents) {
+  OfflinePageTabHelper* tab_helper =
+      OfflinePageTabHelper::FromWebContents(web_contents);
+  return tab_helper ? tab_helper->offline_page() : nullptr;
+}
+
 }  // namespace offline_pages