Add a "forwarded" flag to usergesture tokens.

Source/platform/UserGestureIndicator.h

 /*
  * 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 30 matching lines @@
     PossiblyProcessingUserGesture,
     DefinitelyNotProcessingUserGesture
 };
 
 class PLATFORM_EXPORT UserGestureToken : public RefCounted<UserGestureToken> {
 public:
     virtual ~UserGestureToken() { }
     virtual bool hasGestures() const = 0;
     virtual void setOutOfProcess() = 0;
     virtual void setJavascriptPrompt() = 0;
+    virtual bool wasForwarded() const = 0;
+    virtual void setForwarded() = 0;
 };
 
 class PLATFORM_EXPORT UserGestureIndicatorDisabler {
     WTF_MAKE_NONCOPYABLE(UserGestureIndicatorDisabler);
 public:
     UserGestureIndicatorDisabler();
     ~UserGestureIndicatorDisabler();
 
 private:
     ProcessingUserGestureState m_savedState;
@@ skipping 19 matching lines @@
     static ProcessingUserGestureState s_state;
     static UserGestureIndicator* s_topmostIndicator;
     static bool s_processedUserGestureInPast;
     ProcessingUserGestureState m_previousState;
     RefPtr<UserGestureToken> m_token;
 };
 
 }
 
 #endif