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

Source/web/WebScopedUserGesture.cpp

Index: Source/web/WebScopedUserGesture.cpp
diff --git a/Source/web/WebScopedUserGesture.cpp b/Source/web/WebScopedUserGesture.cpp
index 81eac8678738ce91b47ca65c205ff6b7c078a34b..f47dac871e08461bfe883623a89185d7885c7be6 100644
--- a/Source/web/WebScopedUserGesture.cpp
+++ b/Source/web/WebScopedUserGesture.cpp
@@ -47,6 +47,11 @@ void WebScopedUserGesture::initializeWithToken(const WebUserGestureToken& token)
         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);