Proper implementation of Dart_GetStackTrace.

runtime/vm/debugger_api_impl.cc

Index: runtime/vm/debugger_api_impl.cc
diff --git a/runtime/vm/debugger_api_impl.cc b/runtime/vm/debugger_api_impl.cc
index 87c6f46d1bba4f486ba442dbf0fc9d86e1522035..4518faa595c9fc0f7b4f8e94ee9381ef36d10104 100644
--- a/runtime/vm/debugger_api_impl.cc
+++ b/runtime/vm/debugger_api_impl.cc
@@ -172,6 +172,20 @@ DART_EXPORT Dart_Handle Dart_GetStackTrace(Dart_StackTrace* trace) {
   return Api::True(isolate);
 }
 
+DART_EXPORT Dart_Handle Dart_GetStackTrace2() {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  const GrowableObjectArray& scriptUrls =
+      GrowableObjectArray::Handle(GrowableObjectArray::New(8));
+  DebuggerStackTrace* stackTrace = isolate->debugger()->CollectStackTrace();
+  for (intptr_t i = 0; i < stackTrace->Length(); ++i) {
+    String& scriptUrl = String::Handle();
+    scriptUrl ^= stackTrace->ActivationFrameAt(i)->SourceUrl();
+    scriptUrls.Add(scriptUrl);
+  }
+  return Api::NewHandle(isolate, Array::MakeArray(scriptUrls));
+}
+
 
 DART_EXPORT Dart_Handle Dart_ActivationFrameInfo(
                             Dart_ActivationFrame activation_frame,