Add a "forwarded" flag to usergesture tokens.

Source/platform/UserGestureIndicator.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 70 matching lines @@
     }
 
     virtual void setJavascriptPrompt() OVERRIDE
     {
         if (WTF::currentTime() - m_timestamp > userGestureTimeout)
             return;
         if (hasGestures())
             m_javascriptPrompt = true;
     }
 
+    virtual bool wasForwarded() const OVERRIDE
+    {
+        return m_forwarded;
+    }
+
+    virtual void setForwarded() OVERRIDE
+    {
+        m_forwarded = true;
+    }
+
 private:
     GestureToken()
         : m_consumableGestures(0),
         m_timestamp(0),
         m_outOfProcess(false),
-        m_javascriptPrompt(false)
+        m_javascriptPrompt(false),
+        m_forwarded(false)
     {
     }
 
     size_t m_consumableGestures;
     double m_timestamp;
     bool m_outOfProcess;
     bool m_javascriptPrompt;
+    bool m_forwarded;
 };
 
 }
 
 static bool isDefinite(ProcessingUserGestureState state)
 {
     return state == DefinitelyProcessingNewUserGesture || state == DefinitelyProcessingUserGesture || state == DefinitelyNotProcessingUserGesture;
 }
 
 ProcessingUserGestureState UserGestureIndicator::s_state = DefinitelyNotProcessingUserGesture;
@@ skipping 107 matching lines @@
 }
 
 UserGestureIndicatorDisabler::~UserGestureIndicatorDisabler()
 {
     RELEASE_ASSERT(isMainThread());
     UserGestureIndicator::s_state = m_savedState;
     UserGestureIndicator::s_topmostIndicator = m_savedIndicator;
 }
 
 }