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

third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/inspector/ThreadDebugger.h"
 
 #include <memory>
 #include "bindings/core/v8/SourceLocation.h"
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "bindings/core/v8/V8DOMException.h"
@@ skipping 71 matching lines @@
                                         bool recurring) {
   v8_inspector_->asyncTaskScheduled(ToV8InspectorStringView(operation_name),
                                     task, recurring);
 }
 
 void ThreadDebugger::AsyncTaskCanceled(void* task) {
   v8_inspector_->asyncTaskCanceled(task);
 }
 
 void ThreadDebugger::AllAsyncTasksCanceled() {
+  current_async_tasks_ = 0;
   v8_inspector_->allAsyncTasksCanceled();
 }
 
-void ThreadDebugger::AsyncTaskStarted(void* task) {
-  v8_inspector_->asyncTaskStarted(task);
+bool ThreadDebugger::AsyncTaskStarted(void* task, bool optional) {
+  if (!current_async_tasks_ || !optional) {
+    ++current_async_tasks_;
+    v8_inspector_->asyncTaskStarted(task);
+    return true;
+  }
+  return false;
 }
 
 void ThreadDebugger::AsyncTaskFinished(void* task) {
+  if (current_async_tasks_ > 0)
+    --current_async_tasks_;
   v8_inspector_->asyncTaskFinished(task);
 }
 
 unsigned ThreadDebugger::PromiseRejected(
     v8::Local<v8::Context> context,
     const String& error_message,
     v8::Local<v8::Value> exception,
     std::unique_ptr<SourceLocation> location) {
   const String default_message = "Uncaught (in promise)";
   String message = error_message;
@@ skipping 361 matching lines @@
 void ThreadDebugger::OnTimer(TimerBase* timer) {
   for (size_t index = 0; index < timers_.size(); ++index) {
     if (timers_[index].get() == timer) {
       timer_callbacks_[index](timer_data_[index]);
       return;
     }
   }
 }
 
 }  // namespace blink