Add type inference of annotations.

pkg/front_end/testcases/inference/downwards_inference_annotations_class_members.dart

Index: pkg/front_end/testcases/inference/downwards_inference_annotations_class_members.dart
diff --git a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart b/pkg/front_end/testcases/inference/downwards_inference_annotations_class_members.dart
similarity index 60%
copy from pkg/front_end/testcases/inference/downwards_inference_annotations.dart
copy to pkg/front_end/testcases/inference/downwards_inference_annotations_class_members.dart
index fd31916c8fdba60cc4e6fb865ba35525d4a952b5..37db38e18409d533bc3e2b1cebce17f0ae7f8d30 100644
--- a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart
+++ b/pkg/front_end/testcases/inference/downwards_inference_annotations_class_members.dart
@@ -7,11 +7,17 @@ library test;
 
 class Foo {
   const Foo(List<String> l);
-  const Foo.named(List<String> l);
 }
 
-@Foo(/*@typeArgs=String*/ const [])
-class Bar {}
+abstract class Bar {
+  @Foo(/*@typeArgs=String*/ const [])
+  Bar();
 
-@Foo.named(/*@typeArgs=String*/ const [])
-class Baz {}
+  @Foo(/*@typeArgs=String*/ const [])
+  var /*@topType=dynamic*/ x;
+
+  @Foo(/*@typeArgs=String*/ const [])
+  void f();
+}
+
+main() {}