Improve stack traces for async functions

src/inspector/v8-debugger.h

Index: src/inspector/v8-debugger.h
diff --git a/src/inspector/v8-debugger.h b/src/inspector/v8-debugger.h
index 8f02aa0aea2d065bcbc49a8eda03b60a0121ce68..649afc69cb86f3d4baeba660349db02e199ed064 100644
--- a/src/inspector/v8-debugger.h
+++ b/src/inspector/v8-debugger.h
@@ -132,6 +132,8 @@ class V8Debugger {
                                         v8::Local<v8::Function>);
   v8::MaybeLocal<v8::Value> functionScopes(v8::Local<v8::Context>,
                                            v8::Local<v8::Function>);
+  void asyncTaskScheduled(const String16& taskName, void* task, bool recurring,
+                          bool skipInitialFrame);
 
   v8::Isolate* m_isolate;
   V8InspectorImpl* m_inspector;