Mouse event handlers use user gesture tokens on top-level LocalFrames.

Source/core/frame/LocalFrame.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 81 matching lines @@
         NavigationScheduler& navigationScheduler() const;
         FrameSelection& selection() const;
         InputMethodController& inputMethodController() const;
         FetchContext& fetchContext() const { return loader().fetchContext(); }
         ScriptController& script();
         SpellChecker& spellChecker() const;
         FrameConsole& console() const;
 
         void didChangeVisibilityState();
 
+        // FIXME: This method is only used by EventHandler to get the highest level
+        // LocalFrame in this frame's in-process subtree. When user gesture tokens
+        // are synchronized across processes this method should be removed.
+        LocalFrame* localFrameRoot();
+
     // ======== All public functions below this point are candidates to move out of LocalFrame into another class. ========
 
         bool inScope(TreeScope*) const;
 
         void countObjectsNeedingLayout(unsigned& needsLayoutObjects, unsigned& totalObjects, bool& isPartial);
 
         // See GraphicsLayerClient.h for accepted flags.
         String layerTreeAsText(unsigned flags = 0) const;
         String trackedRepaintRectsAsText() const;
 
@@ skipping 137 matching lines @@
     DEFINE_TYPE_CASTS(LocalFrame, Frame, localFrame, localFrame->isLocalFrame(), localFrame.isLocalFrame());
 
 } // namespace WebCore
 
 // During refactoring, there are some places where we need to do type conversions that
 // will not be needed once all instances of LocalFrame and RemoteFrame are sorted out.
 // At that time this #define will be removed and all the uses of it will need to be corrected.
 #define toLocalFrameTemporary toLocalFrame
 
 #endif // LocalFrame_h