Session restore: Store and restore persistent IDs for sessionStorage.

content/public/browser/session_storage_namespace.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_
 #define CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 
 namespace content {
 
 // This is a ref-counted class that represents a SessionStorageNamespace.
 // On destruction it ensures that the storage namespace is destroyed.
 class SessionStorageNamespace
     : public base::RefCountedThreadSafe<SessionStorageNamespace> {
  public:
-  SessionStorageNamespace() {}
-
   // Returns the ID of the |SessionStorageNamespace|. The ID is unique among all
   // SessionStorageNamespace objects, but not unique across browser runs.
   virtual int64 id() const = 0;
 
   // Returns the persistent ID for the |SessionStorageNamespace|. The ID is
   // unique across browser runs.
   virtual const std::string& persistent_id() const = 0;
 
+  // For marking that the sessionStorage will be needed or won't be needed by
+  // session restore.
+  virtual void SetShouldPersist(bool should_persist) = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<SessionStorageNamespace>;
   virtual ~SessionStorageNamespace() {}
-
-  DISALLOW_COPY_AND_ASSIGN(SessionStorageNamespace);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_