Reload offline version on load failure

ios/web/web_state/ui/crw_web_controller.h

 // Copyright 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.
 
 #ifndef IOS_WEB_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_
 #define IOS_WEB_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/web/net/crw_request_tracker_delegate.h"
@@ skipping 156 matching lines @@
 
 // Loads HTML in the page and presents it as if it was originating from an
 // application specific URL.
 - (void)loadHTML:(NSString*)HTML forAppSpecificURL:(const GURL&)URL;
 
 // Loads HTML in the page and presents it as if it was originating from the
 // URL itself. Should be used only in specific cases, where the injected html
 // is guaranteed to be some derived representation of the original content.
 - (void)loadHTMLForCurrentURL:(NSString*)HTML;
 
+// Loads the offline version of |URL| as the loading of the online version
+// failed.
+- (void)displayOfflineVersionForURL:(const GURL&)URL;

[Eugene But (OOO till 7-30), 2016/12/15 19:10:03]

Who will call this method? Please note that ios/chrome later should not be
allowed to use CRWWebController.

+
 // Stops loading the page.
 - (void)stopLoading;
 
 // Causes the page to start loading immediately if there is a pending load;
 // normally if the web view has been paged out for memory reasons, loads are
 // started lazily the next time the view is displayed. This can be called to
 // bypass the lazy behavior. This is equivalent to calling -view, but should be
 // used when deliberately pre-triggering a load without displaying.
 - (void)triggerPendingLoad;
 
@@ skipping 111 matching lines @@
 
 // Acts on a single message from the JS object, parsed from JSON into a
 // DictionaryValue. Returns NO if the format for the message was invalid.
 - (BOOL)respondToMessage:(base::DictionaryValue*)crwMessage
        userIsInteracting:(BOOL)userIsInteracting
                originURL:(const GURL&)originURL;
 
 @end
 
 #endif  // IOS_WEB_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_