Created SerializedUserDataManager.

ios/web/navigation/crw_serialized_navigation_manager.h

 // Copyright 2015 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_CRW_SERIALIZED_NAVIGATION_MANAGER_H_
 #define IOS_WEB_NAVIGATION_CRW_SERIALIZED_NAVIGATION_MANAGER_H_
 
 #import <Foundation/Foundation.h>
 
 @class CRWSessionCertificatePolicyManager;
@@ skipping 18 matching lines @@
 @property(nonatomic, assign) NSTimeInterval lastVisitedTimestamp;
 // TODO(kkhorimoto): |entries| currently contains CRWSessionEntries.  Once
 // NavigationItemImpls are encoded/decoded using CRWSerializedNavigationItems
 // (analogous to the approach taken with NavigationManagerImpl), this will
 // become an array of CRWSerializedNavigationItems.
 @property(nonatomic, copy) NSArray* entries;
 @property(nonatomic, retain)
     CRWSessionCertificatePolicyManager* sessionCertificatePolicyManager;
 @property(nonatomic, retain) XCallbackParameters* XCallbackParameters;
 
+// A dictionary of arbitrary serialized data added using
+// SerializedUserDataManager.
+@property(nonatomic, copy) NSDictionary* serializedUserData;
+
 @end
 
 #endif  // IOS_WEB_NAVIGATION_CRW_SERIALIZED_NAVIGATION_MANAGER_H_