[DevTools] added creation stack for event listeners without scheduled stack

third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp b/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp
index ad844fa998c4c7a6487405d239eace46c462ff04..3b207e40739c8a899e235344eb256e638836b882 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp
@@ -39,6 +39,7 @@
 #include "core/dom/ExecutionContext.h"
 #include "core/events/BeforeUnloadEvent.h"
 #include "core/events/Event.h"
+#include "core/probe/CoreProbes.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "platform/InstanceCounters.h"
 #include "platform/bindings/V8PrivateProperty.h"
@@ -60,9 +61,12 @@ V8AbstractEventListener::V8AbstractEventListener(bool is_attribute,
   else
     worker_global_scope_ =
         ToWorkerGlobalScope(CurrentExecutionContext(isolate));
+  probe::AsyncTaskScheduled(CurrentExecutionContext(isolate), "Event Listener",

[dgozman, 2017/05/10 18:36:30]

Can we have an event name? I really liked it. E.g. "click event".

[kozy, 2017/05/10 21:24:01]

Done.

+                            this);
 }
 
 V8AbstractEventListener::~V8AbstractEventListener() {
+  probe::AsyncTaskCanceled(CurrentExecutionContext(isolate_), this);

[dgozman, 2017/05/10 18:36:30]

I am worried CurrentExecutionContext() could be wrong here.

[kozy, 2017/05/10 21:24:00]

Done.

   DCHECK(listener_.IsEmpty());
   if (IsMainThread())
     InstanceCounters::DecrementCounter(
@@ -142,6 +146,8 @@ void V8AbstractEventListener::InvokeEventHandler(
     event_symbol.Set(global, js_event);
     try_catch.Reset();
 
+    probe::AsyncTask async_task(ExecutionContext::From(script_state), this,
+                                "Event Listener called", true, true);
     return_value = CallListenerFunction(script_state, js_event, event);
     if (try_catch.HasCaught())
       event->target()->UncaughtExceptionInEventHandler();