InstantExtended: Transient naventry for preview.

content/public/browser/navigation_controller.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_NAVIGATION_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 247 matching lines @@
   // corresponds to a new navigation (created via LoadURL).
   virtual int GetPendingEntryIndex() const = 0;
 
   // Transient entry -----------------------------------------------------------
 
   // Returns the transient entry if any. This is an entry which is removed and
   // discarded if any navigation occurs. Note that the returned entry is owned
   // by the navigation controller and may be deleted at any time.
   virtual NavigationEntry* GetTransientEntry() const = 0;
 
+  // Adds an entry that is returned by GetActiveEntry(). The entry is
+  // transient: any navigation causes it to be removed and discarded.  The
+  // NavigationController becomes the owner of |entry| and deletes it when
+  // it discards it. This is useful with interstitial page that need to be
+  // represented as an entry, but should go away when the user navigates away
+  // from them.
+  // Note that adding a transient entry does not change the active contents.
+  virtual void AddTransientEntry(NavigationEntry* entry) = 0;
+
   // New navigations -----------------------------------------------------------
 
   // Loads the specified URL, specifying extra http headers to add to the
   // request.  Extra headers are separated by \n.
   virtual void LoadURL(const GURL& url,
                        const Referrer& referrer,
                        PageTransition type,
                        const std::string& extra_headers) = 0;
 
   // More general version of LoadURL. See comments in LoadURLParams for
@@ skipping 101 matching lines @@
   virtual void PruneAllButActive() = 0;
 
   // Clears all screenshots associated with navigation entries in this
   // controller. Useful to reduce memory consumption in low-memory situations.
   virtual void ClearAllScreenshots() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_