Add a "forwarded" flag to usergesture tokens.

Source/core/frame/DOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 846 matching lines @@
         return;
 
     RefPtrWillBeRawPtr<MessageEvent> event = timer->event();
 
     // Give the embedder a chance to intercept this postMessage because this
     // DOMWindow might be a proxy for another in browsers that support
     // postMessage calls across WebKit instances.
     if (m_frame->loader().client()->willCheckAndDispatchMessageEvent(timer->targetOrigin(), event.get()))
         return;
 
-    UserGestureIndicator gestureIndicator(timer->userGestureToken());
+    UserGestureToken* token = timer->userGestureToken();
+    if (token)
+        token->setForwarded();
+    UserGestureIndicator gestureIndicator(token);
 
     event->entangleMessagePorts(document());
     dispatchMessageEventWithOriginCheck(timer->targetOrigin(), event, timer->stackTrace());
 }
 
 void DOMWindow::dispatchMessageEventWithOriginCheck(SecurityOrigin* intendedTargetOrigin, PassRefPtrWillBeRawPtr<Event> event, PassRefPtr<ScriptCallStack> stackTrace)
 {
     if (intendedTargetOrigin) {
         // Check target origin now since the target document may have changed since the timer was scheduled.
         if (!intendedTargetOrigin->isSameSchemeHostPort(document()->securityOrigin())) {
@@ skipping 1000 matching lines @@
     visitor->trace(m_media);
     visitor->trace(m_sessionStorage);
     visitor->trace(m_localStorage);
     visitor->trace(m_applicationCache);
     visitor->trace(m_performance);
     visitor->trace(m_css);
     WillBeHeapSupplementable<DOMWindow>::trace(visitor);
 }
 
 } // namespace WebCore