[inspector] changed a way of preserving stepping between tasks

src/debug/debug.h

Index: src/debug/debug.h
diff --git a/src/debug/debug.h b/src/debug/debug.h
index 34b4fe2c2cf66cac9cb52de519616df1abf2009e..38e61ebcf854a4df21be302b294a19082b604fe3 100644
--- a/src/debug/debug.h
+++ b/src/debug/debug.h
@@ -332,6 +332,7 @@ class Debug {
   bool IsBlackboxed(Handle<SharedFunctionInfo> shared);
 
   void SetDebugDelegate(debug::DebugDelegate* delegate, bool pass_ownership);
+  void HandleCallCompleted();
 
   // Returns whether the operation succeeded.
   bool EnsureDebugInfo(Handle<SharedFunctionInfo> shared);