Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/navigation/navigation_manager_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_NAVIGATION_NAVIGATION_MANAGER_IMPL_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
 @class CRWSessionController;
 
 namespace web {
 class BrowserState;
 class NavigationItem;
 struct Referrer;
 class NavigationManagerDelegate;
 class NavigationManagerFacadeDelegate;
+class NavigationManagerStorageBuilder;
 
 // Implementation of NavigationManager.
 // Generally mirrors upstream's NavigationController.
 class NavigationManagerImpl : public NavigationManager {
  public:
-  NavigationManagerImpl(NavigationManagerDelegate* delegate,
-                        BrowserState* browser_state);
+  NavigationManagerImpl();
   ~NavigationManagerImpl() override;
 
+  // Setters for NavigationManagerDelegate and BrowserState.
+  void SetDelegate(NavigationManagerDelegate* delegate);
+  void SetBrowserState(BrowserState* browser_state);
+
   // Sets the CRWSessionController that backs this object.
   // Keeps a strong reference to |session_controller|.
   // This method should only be called when deserializing |session_controller|
   // and joining it with its NavigationManager. Other cases should call
   // InitializeSession() or ReplaceSessionHistory().
   // TODO(stuartmorgan): Also move deserialization of CRWSessionControllers
   // under the control of this class, and move the bulk of CRWSessionController
   // logic into it.
   void SetSessionController(CRWSessionController* session_controller);
 
@@ skipping 85 matching lines @@
   void CopyState(NavigationManagerImpl* navigation_manager);
 
   // Returns the navigation index that differs from the current item (or pending
   // item if it exists) by the specified |offset|, skipping redirect navigation
   // items. The index returned is not guaranteed to be valid.
   // TODO(crbug.com/661316): Make this method private once navigation code is
   // moved from CRWWebController to NavigationManagerImpl.
   int GetIndexForOffset(int offset) const;
 
  private:
+  // The NavigationManagerStorageBuilder functions require access to
+  // private variables of NavigationManagerImpl.
+  friend NavigationManagerStorageBuilder;
+
   // Returns true if the PageTransition for the underlying navigation item at
   // |index| has ui::PAGE_TRANSITION_IS_REDIRECT_MASK.
   bool IsRedirectItemAtIndex(int index) const;
 
   // The primary delegate for this manager.
   NavigationManagerDelegate* delegate_;
 
   // The BrowserState that is associated with this instance.
   BrowserState* browser_state_;
 
   // CRWSessionController that backs this instance.
   // TODO(stuartmorgan): Fold CRWSessionController into this class.
   base::scoped_nsobject<CRWSessionController> session_controller_;
 
   // Weak pointer to the facade delegate.
   NavigationManagerFacadeDelegate* facade_delegate_;
 
   // List of transient url rewriters added by |AddTransientURLRewriter()|.
   std::unique_ptr<std::vector<BrowserURLRewriter::URLRewriter>>
       transient_url_rewriters_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationManagerImpl);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_IMPL_H_