Virtualize EventDispatchMediator creation and cleanup calling.

Source/core/events/TouchEvent.cpp

Index: Source/core/events/TouchEvent.cpp
diff --git a/Source/core/events/TouchEvent.cpp b/Source/core/events/TouchEvent.cpp
index f1fa3975b112a60a12398ba6aa69e062b2b54224..56ad4335453181dd1fd85f1166afd2286fd000ee 100644
--- a/Source/core/events/TouchEvent.cpp
+++ b/Source/core/events/TouchEvent.cpp
@@ -109,6 +109,12 @@ void TouchEvent::preventDefault()
             "Ignored attempt to cancel a " + type() + " event with cancelable=false, for example because scrolling is in progress and cannot be interrupted."));
     }
 }
+
+PassRefPtrWillBeRawPtr<EventDispatchMediator> TouchEvent::createMediator()
+{
+    return TouchEventDispatchMediator::create(this);
+}
+
 DEFINE_TRACE(TouchEvent)
 {
     visitor->trace(m_touches);