DevTools: Capture async stacks for event listeners.

Source/core/inspector/AsyncCallStackTracker.h

Index: Source/core/inspector/AsyncCallStackTracker.h
diff --git a/Source/core/inspector/AsyncCallStackTracker.h b/Source/core/inspector/AsyncCallStackTracker.h
index e032134eeda9f01c1bf7576ac49ca418d53209cc..7a8889bd77aea18fe86afde2de46f2675e00536e 100644
--- a/Source/core/inspector/AsyncCallStackTracker.h
+++ b/Source/core/inspector/AsyncCallStackTracker.h
@@ -41,6 +41,8 @@
 
 namespace WebCore {
 
+class EventListener;
+class EventTarget;
 class ExecutionContext;
 
 class AsyncCallStackTracker {
@@ -83,6 +85,11 @@ public:
     void didCancelAnimationFrame(ExecutionContext*, int callbackId);
     void willFireAnimationFrame(ExecutionContext*, int callbackId);
 
+    void didAddEventListener(EventTarget*, const AtomicString& eventType, EventListener*, bool useCapture, const ScriptValue& callFrames);
+    void didRemoveEventListener(EventTarget*, const AtomicString& eventType, EventListener*, bool useCapture);
+    void didRemoveAllEventListeners(EventTarget*);
+    void willHandleEvent(EventTarget*, const AtomicString& eventType, EventListener*, bool useCapture);
+
     void didFireAsyncCall();
     void clear();