[inspector] introduced debug::SetAsyncTaskListener

src/debug/debug.h

Index: src/debug/debug.h
diff --git a/src/debug/debug.h b/src/debug/debug.h
index 6eb8b58623f71a63d67678f2952fa9d52829064b..ffe54ef9260a5efb4105dd5173639225e9ab30e9 100644
--- a/src/debug/debug.h
+++ b/src/debug/debug.h
@@ -470,6 +470,8 @@ class Debug {
 
   int NextAsyncTaskId(Handle<JSObject> promise);
 
+  void SetAsyncTaskListener(debug::AsyncTaskListener listener, void* data);
+
   // Returns whether the operation succeeded. Compilation can only be triggered
   // if a valid closure is passed as the second argument, otherwise the shared
   // function needs to be compiled already.
@@ -666,6 +668,9 @@ class Debug {
 
   v8::Debug::MessageHandler message_handler_;
 
+  debug::AsyncTaskListener async_task_listener_ = nullptr;
+  void* async_task_listener_data_ = nullptr;
+
   static const int kQueueInitialSize = 4;
   base::Semaphore command_received_;  // Signaled for each command received.
   LockingCommandMessageQueue command_queue_;