Viewing cached webpages while offline is not available on Chrome OS

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

 // Copyright (c) 2012 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/renderer_host/chrome_resource_dispatcher_host_delegate.h"
 
 #include <string>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 11 matching lines @@
 #include "chrome/browser/prerender/prerender_resource_throttle.h"
 #include "chrome/browser/prerender/prerender_tracker.h"
 #include "chrome/browser/prerender/prerender_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle_factory.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/signin/signin_header_helper.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/browser/ui/login/login_prompt.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/variations/net/variations_http_header_provider.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/resource_context.h"
@@ skipping 313 matching lines @@
               request, io_data);
       if (ephemeral_app_throttle)
         throttles->push_back(ephemeral_app_throttle);
     }
   }
 #endif
 
 #if defined(OS_CHROMEOS)
   // Check if we need to add offline throttle. This should be done only
   // for main frames.
-  if (resource_type == content::RESOURCE_TYPE_MAIN_FRAME) {
+  // We will fall back to the old ChromeOS offline error page if the
+  // --disable-new-offline-error-page command-line switch is defined.
+  bool new_error_page_enabled = switches::NewOfflineErrorPageEnabled();
+  if (!new_error_page_enabled &&
+      resource_type == content::RESOURCE_TYPE_MAIN_FRAME) {
     // We check offline first, then check safe browsing so that we still can
     // block unsafe site after we remove offline page.
     throttles->push_back(new OfflineResourceThrottle(request,
                                                      appcache_service));
   }
 
   // Check if we need to add merge session throttle. This throttle will postpone
   // loading of main frames and XHR request.
   if (resource_type == content::RESOURCE_TYPE_MAIN_FRAME ||
       resource_type == content::RESOURCE_TYPE_XHR) {
@@ skipping 373 matching lines @@
                                        url_request->GetTotalReceivedBytes()));
   }
 }
 
 // static
 void ChromeResourceDispatcherHostDelegate::
     SetExternalProtocolHandlerDelegateForTesting(
     ExternalProtocolHandler::Delegate* delegate) {
   g_external_protocol_handler_delegate = delegate;
 }