Redirect to offline copy on other possible internet connection failures

chrome/browser/android/offline_pages/offline_page_tab_helper.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 58 matching lines @@
       base::Bind(&OfflinePageTabHelper::RedirectFromOfflineToOnline,
                  weak_ptr_factory_.GetWeakPtr(),
                  online_url));
 }
 
 void OfflinePageTabHelper::DidFinishNavigation(
     content::NavigationHandle* navigation_handle) {
   GURL last_redirect_from_url_copy = last_redirect_from_url_;
   last_redirect_from_url_ = GURL();
 
-  // Skips non-main frame or load failure other than no network.
-  if (navigation_handle->GetNetErrorCode() != net::ERR_INTERNET_DISCONNECTED ||
-      !navigation_handle->IsInMainFrame()) {
+  // Skips non-main frame.
+  if (!navigation_handle->IsInMainFrame())
+    return;
+
+  // Skips load failure other than no network.
+  net::Error error_code = navigation_handle->GetNetErrorCode();
+  if (error_code != net::ERR_INTERNET_DISCONNECTED &&
+      error_code != net::ERR_NAME_NOT_RESOLVED &&
+      error_code != net::ERR_ADDRESS_UNREACHABLE &&
+      error_code != net::ERR_PROXY_CONNECTION_FAILED) {
     return;
   }
 
-  // Redirecting to offline version will only take effect when there is no
-  // network connection.
-  if (!net::NetworkChangeNotifier::IsOffline())
-    return;
-
   // On a forward or back transition, don't affect the order of the nav stack.
   if (navigation_handle->GetPageTransition() ==
       ui::PAGE_TRANSITION_FORWARD_BACK) {
     return;
   }
 
   // Skips if not loading an online version of saved page.
   GURL offline_url = offline_pages::OfflinePageUtils::GetOfflineURLForOnlineURL(
       web_contents()->GetBrowserContext(), navigation_handle->GetURL());
   if (!offline_url.is_valid())
@@ skipping 20 matching lines @@
 
 void OfflinePageTabHelper::RedirectFromOnlineToOffline(
     const GURL& offline_url) {
   UMA_HISTOGRAM_COUNTS("OfflinePages.RedirectToOfflineCount", 1);
   content::NavigationController::LoadURLParams load_params(offline_url);
   load_params.transition_type = ui::PAGE_TRANSITION_CLIENT_REDIRECT;
   web_contents()->GetController().LoadURLWithParams(load_params);
 }
 
 }  // namespace offline_pages