Add Frame::isMainFrame and deploy it

Source/core/frame/Frame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 106 matching lines @@
 
         void addDestructionObserver(FrameDestructionObserver*);
         void removeDestructionObserver(FrameDestructionObserver*);
 
         void willDetachPage();
         void detachFromPage();
         void disconnectOwnerElement();
 
         Page* page() const;
         HTMLFrameOwnerElement* ownerElement() const;
+        bool isMainFrame() const;
 
         void setDOMWindow(PassRefPtr<DOMWindow>);
         DOMWindow* domWindow() const;
         Document* document() const;
         FrameView* view() const;
 
         Editor& editor() const;
         EventHandler& eventHandler() const;
         FrameLoader& loader() const;
         NavigationScheduler& navigationScheduler() const;
@@ skipping 180 matching lines @@
 
     inline EventHandler& Frame::eventHandler() const
     {
         ASSERT(m_eventHandler);
         return *m_eventHandler;
     }
 
 } // namespace WebCore
 
 #endif // Frame_h