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

third_party/WebKit/Source/core/probe/CoreProbes.cpp

Index: third_party/WebKit/Source/core/probe/CoreProbes.cpp
diff --git a/third_party/WebKit/Source/core/probe/CoreProbes.cpp b/third_party/WebKit/Source/core/probe/CoreProbes.cpp
index 27d41ba1e9d9a11650a4b1234a7afa85121ed9e7..23d6dcb8bed2fabc85de52e617c6bb086fa79e9c 100644
--- a/third_party/WebKit/Source/core/probe/CoreProbes.cpp
+++ b/third_party/WebKit/Source/core/probe/CoreProbes.cpp
@@ -53,10 +53,12 @@ namespace probe {
 AsyncTask::AsyncTask(ExecutionContext* context,
                      void* task,
                      const char* step,
-                     bool enabled)
+                     bool enabled,
+                     bool optional)
     : debugger_(enabled ? ThreadDebugger::From(ToIsolate(context)) : nullptr),
       task_(task),
-      recurring_(step) {
+      recurring_(step),
+      started_(false) {
   if (recurring_) {
     TRACE_EVENT_FLOW_STEP0("devtools.timeline.async", "AsyncTask",
                            TRACE_ID_LOCAL(reinterpret_cast<uintptr_t>(task)),
@@ -65,13 +67,15 @@ AsyncTask::AsyncTask(ExecutionContext* context,
     TRACE_EVENT_FLOW_END0("devtools.timeline.async", "AsyncTask",
                           TRACE_ID_LOCAL(reinterpret_cast<uintptr_t>(task)));
   }
-  if (debugger_)
-    debugger_->AsyncTaskStarted(task_);
+  if (debugger_) {
+    started_ = debugger_->AsyncTaskStarted(task_, optional);
+  }
 }
 
 AsyncTask::~AsyncTask() {
   if (debugger_) {
-    debugger_->AsyncTaskFinished(task_);
+    if (started_)
+      debugger_->AsyncTaskFinished(task_);
     if (!recurring_)
       debugger_->AsyncTaskCanceled(task_);
   }