DevTools: Capture async stacks for event listeners.

Source/core/inspector/InspectorDOMDebuggerAgent.h

Index: Source/core/inspector/InspectorDOMDebuggerAgent.h
diff --git a/Source/core/inspector/InspectorDOMDebuggerAgent.h b/Source/core/inspector/InspectorDOMDebuggerAgent.h
index 2b0b87bfc943d5db4b6af8a928a752fd6e73eaa0..e1db62b7fc390fa14c4a498a332daf0deff7d2d5 100644
--- a/Source/core/inspector/InspectorDOMDebuggerAgent.h
+++ b/Source/core/inspector/InspectorDOMDebuggerAgent.h
@@ -42,7 +42,8 @@ namespace WebCore {
 
 class Document;
 class Element;
-class Event;
+class EventListener;
+class EventTarget;
 class InspectorDOMAgent;
 class InspectorDebuggerAgent;
 class InspectorFrontend;
@@ -83,7 +84,7 @@ public:
     void didRequestAnimationFrame(Document*, int callbackId);
     void didCancelAnimationFrame(Document*, int callbackId);
     void willFireAnimationFrame(Document*, int callbackId);
-    void willHandleEvent(Event*);
+    void willHandleEvent(EventTarget*, const AtomicString& eventType, EventListener*, bool useCapture);
     void didFireWebGLError(const String& errorName);
     void didFireWebGLWarning();
     void didFireWebGLErrorOrWarning(const String& message);