Add type inference of annotations.

pkg/front_end/testcases/inference/downwards_inference_annotations_parameter_local.dart

Index: pkg/front_end/testcases/inference/downwards_inference_annotations_parameter_local.dart
diff --git a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart b/pkg/front_end/testcases/inference/downwards_inference_annotations_parameter_local.dart
similarity index 58%
copy from pkg/front_end/testcases/inference/downwards_inference_annotations.dart
copy to pkg/front_end/testcases/inference/downwards_inference_annotations_parameter_local.dart
index fd31916c8fdba60cc4e6fb865ba35525d4a952b5..6cc32b381857e25c948701f45954874915786d36 100644
--- a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart
+++ b/pkg/front_end/testcases/inference/downwards_inference_annotations_parameter_local.dart
@@ -7,11 +7,12 @@ library test;
 
 class Foo {
   const Foo(List<String> l);
-  const Foo.named(List<String> l);
 }
 
-@Foo(/*@typeArgs=String*/ const [])
-class Bar {}
+void test() {
+  void f(@Foo(/*@typeArgs=String*/ const []) /*@type=dynamic*/ x) {}
+  var /*@type=(dynamic) -> Null*/ x = /*@returnType=Null*/ (/*@type=dynamic*/ @Foo(/*@typeArgs=String*/ const [])
+      x) {};
+}
 
-@Foo.named(/*@typeArgs=String*/ const [])
-class Baz {}
+main() {}