Expose the timestamp associated with a user gesture, and make it possible to recreate a new user ge…

Source/web/WebScopedUserGesture.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
 {
     m_indicator.reset(new WebCore::UserGestureIndicator(WebCore::DefinitelyProcessingNewUserGesture));
 }
 
 void WebScopedUserGesture::initializeWithToken(const WebUserGestureToken& token)
 {
     if (!token.isNull())
         m_indicator.reset(new WebCore::UserGestureIndicator(token));
 }
 
+void WebScopedUserGesture::initializeWithTimestamp(double timestamp)
+{
+    m_indicator.reset(new WebCore::UserGestureIndicator(timestamp));
+}
+
 void WebScopedUserGesture::reset()
 {
     m_indicator.reset(0);
 }
 
 } // namespace blink