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

public/web/WebUserGestureToken.h

 /*
  * Copyright (C) 2013 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 36 matching lines @@
     WebUserGestureToken() { }
     WebUserGestureToken(const WebUserGestureToken& other) { assign(other); }
     WebUserGestureToken& operator=(const WebUserGestureToken& other)
     {
         assign(other);
         return *this;
     }
     ~WebUserGestureToken() { reset(); }
 
     BLINK_EXPORT bool hasGestures() const;
+    BLINK_EXPORT double timestamp() const;
     BLINK_EXPORT void setOutOfProcess();
     BLINK_EXPORT void setJavascriptPrompt();
     bool isNull() const { return m_token.isNull(); }
 
 #if BLINK_IMPLEMENTATION
     explicit WebUserGestureToken(PassRefPtr<WebCore::UserGestureToken>);
     operator PassRefPtr<WebCore::UserGestureToken>() const;
 #endif
 
 private:
     BLINK_EXPORT void assign(const WebUserGestureToken&);
     BLINK_EXPORT void reset();
 
     WebPrivatePtr<WebCore::UserGestureToken> m_token;
 };
 
 } // namespace blink
 
 #endif // WebUserGestureToken_h