Don't miss error message in 'restart frame' debug action

Review URL: https://chromiumcodereview.appspot.com/10693095

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12074 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/liveedit.cc

@@ -1824,7 +1824,14 @@ class SingleFrameTarget {
 const char* LiveEdit::RestartFrame(JavaScriptFrame* frame, Zone* zone) {
   SingleFrameTarget target(frame);
 
-  return DropActivationsInActiveThreadImpl(target, true, zone);
+  const char* result = DropActivationsInActiveThreadImpl(target, true, zone);
+  if (result != NULL) {
+    return result;
+  }
+  if (target.saved_status() == LiveEdit::FUNCTION_BLOCKED_UNDER_NATIVE_CODE) {
+    return "Function is blocked under native code";
+  }
+  return NULL;
 }