InitEvent should not do anything if dispatch flag is set.

third_party/WebKit/Source/core/events/TouchEvent.cpp

 /*
  * Copyright 2008, The Android Open Source Project
  * Copyright (C) 2012 Research In Motion Limited. 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 copyright
@@ skipping 50 matching lines @@
 TouchEvent::~TouchEvent()
 {
 }
 
 void TouchEvent::initTouchEvent(ScriptState* scriptState, TouchList* touches, TouchList* targetTouches,
     TouchList* changedTouches, const AtomicString& type,
     AbstractView* view,
     int, int, int, int,
     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
 {
-    if (dispatched())
+    if (isBeingDispatched())
         return;
 
     if (scriptState->world().isIsolatedWorld())
         UIEventWithKeyState::didCreateEventInIsolatedWorld(ctrlKey, altKey, shiftKey, metaKey);
 
     bool cancelable = true;
     if (type == EventTypeNames::touchcancel)
         cancelable = false;
 
     initUIEvent(type, true, cancelable, view, 0);
@@ skipping 55 matching lines @@
     return toTouchEvent(EventDispatchMediator::event());
 }
 
 DispatchEventResult TouchEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
 {
     event().eventPath().adjustForTouchEvent(event());
     return dispatcher.dispatch();
 }
 
 } // namespace blink