[inspector] introduced stepIntoAsync for chained callbacks

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 4dab54b78bcd28e7c0283cc90b6cf3d184ce82aa..c984919022426c7b0f063c4a43ca411ebeeef22d 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -9039,6 +9039,14 @@ void debug::PrepareStep(Isolate* v8_isolate, StepAction action) {
   isolate->debug()->PrepareStep(static_cast<i::StepAction>(action));
 }
 
+void debug::ClearStepping(Isolate* v8_isolate) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
+  ENTER_V8(isolate);
+  CHECK(isolate->debug()->CheckExecutionState());
+  // Clear all current stepping setup.
+  isolate->debug()->ClearStepping();
+}
+
 bool debug::HasNonBlackboxedFrameOnStack(Isolate* v8_isolate) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
   ENTER_V8(isolate);