Implemented WebStateObserver::DidFinishNavigation(NavigationHandle*).

ios/web/web_state/web_state_impl.h

 // Copyright 2013 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_WEB_STATE_IMPL_H_
 #define IOS_WEB_WEB_STATE_WEB_STATE_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 70 matching lines @@
 
   // Called when a navigation is committed.
   void OnNavigationCommitted(const GURL& url);
 
   // Notifies the observers that the URL hash of the current page changed.
   void OnUrlHashChanged();
 
   // Notifies the observers that the history state of the current page changed.
   void OnHistoryStateChanged();
 
+  // Notifies the observers that same page navigation did finish.
+  void OnSamePageNavigation(const GURL& url);
+
+  // Notifies the observers that navigation to error page did finish.
+  void OnErrorPageNavigation(const GURL& url);
+
   // Notifies the observers that the render process was terminated.
   void OnRenderProcessGone();
 
   // Called when a script command is received.
   // Returns true if the command was handled.
   bool OnScriptCommandReceived(const std::string& command,
                                const base::DictionaryValue& value,
                                const GURL& url,
                                bool user_is_interacting);
 
@@ skipping 247 matching lines @@
 
   // Mojo interface registry for this WebState.
   std::unique_ptr<service_manager::InterfaceRegistry> mojo_interface_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(WebStateImpl);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_WEB_STATE_IMPL_H_