Fix build break

Author: Paul van Brenk

Nodejs/Product/Nodejs/Debugger/NodeDebugger.cs

@@ -882,6 +882,10 @@ private IEnumerable<NodeStackFrame> GetLocalFrames(IEnumerable<NodeStackFrame> s
             return backtraceCommand.Running;
         }
 
+        internal IList<NodeThread> GetThreads() {
+            return _threads.Values.ToList();
+        }
+
         internal void SendStepOver(int identity) {
             DebugWriteCommand("StepOver");
             DebuggerClient.RunWithRequestExceptionsHandled(async () => {