[Navigation Experiment] Add WKBasedNavigationManagerImpl.

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 12 matching lines @@
 #include "ios/web/public/java_script_dialog_type.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_delegate.h"
 #include "url/gurl.h"
 
 @class CRWSessionStorage;
 @class CRWWebController;
 @protocol CRWWebViewProxy;
 @class NSURLRequest;
 @class NSURLResponse;
+@protocol WebViewNavigationProxy;
 
 namespace net {
 class HttpResponseHeaders;
 }
 
 namespace web {
 
 class BrowserState;
 struct ContextMenuParams;
 struct FaviconURL;
@@ skipping 219 matching lines @@
   void OnNavigationItemChanged() override;
   void OnNavigationItemCommitted(
       const LoadCommittedDetails& load_details) override;
 
   // Updates the HTTP response headers for the main page using the headers
   // passed to the OnHttpResponseHeadersReceived() function below.
   // GetHttpResponseHeaders() can be used to get the headers.
   void UpdateHttpResponseHeaders(const GURL& url);
 
   WebState* GetWebState() override;
+  id<WebViewNavigationProxy> GetWebViewNavigationProxy() const override;
 
  protected:
   void AddObserver(WebStateObserver* observer) override;
   void RemoveObserver(WebStateObserver* observer) override;
   void AddPolicyDecider(WebStatePolicyDecider* decider) override;
   void RemovePolicyDecider(WebStatePolicyDecider* decider) override;
 
  private:
   // The SessionStorageBuilder functions require access to private variables of
   // WebStateImpl.
@@ skipping 68 matching lines @@
 
   // Mojo interface registry for this WebState.
   std::unique_ptr<WebStateInterfaceProvider> web_state_interface_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(WebStateImpl);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_WEB_STATE_IMPL_H_