Adds web::NavigationItemImpl.

ios/web/public/navigation_item.h

 // Copyright 2014 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_PUBLIC_NAVIGATION_ITEM_H_
 #define IOS_WEB_PUBLIC_NAVIGATION_ITEM_H_
 
+#include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "ui/base/page_transition_types.h"
 
 class GURL;
 
 namespace web {
 struct FaviconStatus;
 struct Referrer;
 struct SSLStatus;
 
 // A NavigationItem is a data structure that captures all the information
 // required to recreate a browsing state. It represents one point in the
 // chain of navigation managed by a NavigationManager.
 class NavigationItem {
  public:
   virtual ~NavigationItem() {}
 
+  // Creates a new NavigationItem.
+  static scoped_ptr<NavigationItem> Create();
+
   // Page-related stuff --------------------------------------------------------
 
   // A unique ID is preserved across commits and redirects, which means that
   // sometimes a NavigationEntry's unique ID needs to be set (e.g. when
   // creating a committed entry to correspond to a to-be-deleted pending entry,
   // the pending entry's ID must be copied).
   virtual int GetUniqueID() const = 0;
 
   // The actual URL of the page. For some about pages, this may be a scary
   // data: URL or something like that. Use GetVirtualURL() below for showing to
@@ skipping 62 matching lines @@
   //   - this navigation was restored and for some reason the
   //     timestamp wasn't available;
   //   - or this navigation was copied from a foreign session.
   virtual void SetTimestamp(base::Time timestamp) = 0;
   virtual base::Time GetTimestamp() const = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_NAVIGATION_ITEM_H_