Handle JS-calls in impact_test.

pkg/compiler/lib/src/js_backend/backend_serialization.dart

Index: pkg/compiler/lib/src/js_backend/backend_serialization.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend_serialization.dart b/pkg/compiler/lib/src/js_backend/backend_serialization.dart
index 834daaea3b87b0111bfae81654913cd8dbac5485..a4e577e1fe46dea59a7101fe7ec5a63e38ed5554 100644
--- a/pkg/compiler/lib/src/js_backend/backend_serialization.dart
+++ b/pkg/compiler/lib/src/js_backend/backend_serialization.dart
@@ -5,8 +5,9 @@
 library js_backend.serialization;
 
 import '../common/backend_api.dart' show BackendSerialization;
-import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
+import '../elements/resolution_types.dart';
+import '../elements/types.dart';
 import '../js/js.dart' as js;
 import '../native/native.dart';
 import '../serialization/keys.dart';
@@ -156,7 +157,7 @@ class NativeBehaviorSerialization {
   static const int SPECIAL_TYPE = 2;
 
   static int getTypeKind(var type) {
-    if (type is ResolutionDartType) {
+    if (type is DartType) {
       // TODO(johnniwinther): Remove this when annotation are no longer resolved
       // to this-types.
       if (type is GenericType &&