Add subtype matching rules for function types.

pkg/front_end/testcases/inference/unsafe_block_closure_inference_method_call_implicit_type_param.dart.strong.expect

Index: pkg/front_end/testcases/inference/unsafe_block_closure_inference_method_call_implicit_type_param.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/unsafe_block_closure_inference_method_call_implicit_type_param.dart.strong.expect b/pkg/front_end/testcases/inference/unsafe_block_closure_inference_method_call_implicit_type_param.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..9ac36986a65743ce540e2b0b9a97ea572678cca1
--- /dev/null
+++ b/pkg/front_end/testcases/inference/unsafe_block_closure_inference_method_call_implicit_type_param.dart.strong.expect
@@ -0,0 +1,16 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class C extends core::Object {
+  constructor •() → void
+    : super core::Object::•()
+    ;
+  method f(() → dynamic g) → core::List<dynamic>
+    return <dynamic>[g.call()];
+}
+static method main() → dynamic {
+  core::List<core::int> v = new self::C::•().{self::C::f}(() → core::int {
+    return 1;
+  });
+}