Add UseCounter on Event::stop{Immediate,}Propagation().

third_party/WebKit/Source/core/events/Event.idl

 /*
  * Copyright (C) 2006, 2007, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 17 matching lines @@
     readonly attribute EventTarget? target;
     readonly attribute EventTarget? currentTarget;
     [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventComposedPath, CallWith=ScriptState] sequence<EventTarget> composedPath();
 
     const unsigned short NONE = 0;
     const unsigned short CAPTURING_PHASE = 1;
     const unsigned short AT_TARGET = 2;
     const unsigned short BUBBLING_PHASE = 3;
     readonly attribute unsigned short eventPhase;
 
-    void stopPropagation();
-    void stopImmediatePropagation();
+    [Measure] void stopPropagation();
+    [Measure] void stopImmediatePropagation();
 
     readonly attribute boolean bubbles;
     readonly attribute boolean cancelable;
     void preventDefault();
     readonly attribute boolean defaultPrevented;
 
     [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventComposed] readonly attribute boolean composed;
 
     [Unforgeable] readonly attribute boolean isTrusted;
 
@@ skipping 19 matching lines @@
     const unsigned short DRAGDROP  = 2048;
     const unsigned short FOCUS     = 4096;
     const unsigned short BLUR      = 8192;
     const unsigned short SELECT    = 16384;
     const unsigned short CHANGE    = 32768;
     [MeasureAs=EventSrcElement] readonly attribute EventTarget srcElement;
     [MeasureAs=EventReturnValue, CallWith=ExecutionContext, ImplementedAs=legacyReturnValue] attribute boolean returnValue;
     [MeasureAs=EventCancelBubble, CallWith=ExecutionContext] attribute boolean cancelBubble;
     [MeasureAs=EventPath, CallWith=ScriptState] readonly attribute EventTarget[] path;
 };