Add type inference of annotations.

pkg/front_end/testcases/inference/downwards_inference_annotations_type_variable_local.dart

Index: pkg/front_end/testcases/inference/downwards_inference_annotations_type_variable_local.dart
diff --git a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart b/pkg/front_end/testcases/inference/downwards_inference_annotations_type_variable_local.dart
similarity index 62%
copy from pkg/front_end/testcases/inference/downwards_inference_annotations.dart
copy to pkg/front_end/testcases/inference/downwards_inference_annotations_type_variable_local.dart
index fd31916c8fdba60cc4e6fb865ba35525d4a952b5..cd5fe2c5c32f5f69fea0fab7742e56a0e394b85d 100644
--- a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart
+++ b/pkg/front_end/testcases/inference/downwards_inference_annotations_type_variable_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 []) T>() {}
+  var /*@type=() -> Null*/ x =
+      <@Foo(/*@typeArgs=String*/ const []) T> /*@returnType=Null*/ () {};
+}
 
-@Foo.named(/*@typeArgs=String*/ const [])
-class Baz {}
+main() {}