Enable download page action for error page

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 2a6afa6e749f808ae28297228575daa92f5534b1..a640ab48cc48650abb7a49a96843b2a40bbcddf9 100644
--- a/chrome/browser/android/offline_pages/offline_page_utils.cc
+++ b/chrome/browser/android/offline_pages/offline_page_utils.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
 #include "chrome/browser/android/offline_pages/request_coordinator_factory.h"
 #include "chrome/browser/android/tab_android.h"
+#include "chrome/browser/net/net_error_tab_helper.h"
 #include "components/offline_pages/core/background/request_coordinator.h"
 #include "components/offline_pages/core/background/save_page_request.h"
 #include "components/offline_pages/core/client_namespace_constants.h"
@@ -139,6 +140,14 @@ bool OfflinePageUtils::IsShowingOfflinePreview(
 }
 
 // static
+bool OfflinePageUtils::IsShowingDownloadButtonInErrorPage(
+    content::WebContents* web_contents) {
+  chrome_browser_net::NetErrorTabHelper* tab_helper =
+      chrome_browser_net::NetErrorTabHelper::FromWebContents(web_contents);
+  return tab_helper && tab_helper->is_showing_download_button_in_error_page();
+}
+
+// static
 bool OfflinePageUtils::GetTabId(content::WebContents* web_contents,
                                 int* tab_id) {
   TabAndroid* tab_android = TabAndroid::FromWebContents(web_contents);