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

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

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
 
 namespace probe {
 
 class CORE_EXPORT AsyncTask {
   STACK_ALLOCATED();
 
  public:
   AsyncTask(ExecutionContext*,
             void* task,
             const char* step = nullptr,
-            bool enabled = true);
+            bool enabled = true,
+            bool optional = false);
   ~AsyncTask();
 
  private:
   ThreadDebugger* debugger_;
   void* task_;
   bool recurring_;
 };
 
 // Called from generated instrumentation code.
 inline CoreProbeSink* ToCoreProbeSink(LocalFrame* frame) {
@@ skipping 43 matching lines @@
                                           unsigned long identifier,
                                           const ResourceResponse&,
                                           Resource*);
 
 }  // namespace probe
 }  // namespace blink
 
 #include "core/CoreProbesInl.h"
 
 #endif  // !defined(CoreProbes_h)