OOPIF: Support session restore by combining/splitting frame PageStates.

content/public/browser/navigation_entry.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_ENTRY_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_ENTRY_H_
 
 #include <string>
 
 #include "base/memory/ref_counted_memory.h"
@@ skipping 67 matching lines @@
 
   // Page state is an opaque blob created by Blink that represents the state of
   // the page. This includes form entries and scroll position for each frame.
   // We store it so that we can supply it back to Blink to restore form state
   // properly when the user goes back and forward.
   //
   // NOTE: This state is saved to disk and used to restore previous states.  If
   // the format is modified in the future, we should still be able to deal with
   // older versions.
   virtual void SetPageState(const PageState& state) = 0;
-  virtual const PageState& GetPageState() const = 0;
+  virtual PageState GetPageState() const = 0;
 
   // Describes the current page that the tab represents. This is the ID that the
   // renderer generated for the page and is how we can tell new versus
   // renavigations.
   virtual void SetPageID(int page_id) = 0;
   virtual int32 GetPageID() const = 0;
 
   // Page-related helpers ------------------------------------------------------
 
   // Returns the title to be displayed on the tab. This could be the title of
@@ skipping 110 matching lines @@
   virtual void SetRedirectChain(const std::vector<GURL>& redirects) = 0;
   virtual const std::vector<GURL>& GetRedirectChain() const = 0;
 
   // True if this entry is restored and hasn't been loaded.
   virtual bool IsRestored() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_ENTRY_H_