Support typedefs in function signatures.

sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.js_emitter;
 
 class MetadataEmitter extends CodeEmitterHelper {
   /// A list of JS expressions that represent metadata, parameter names and
   /// type, and return types.
   final List<String> globalMetadata = [];
@@ skipping 51 matching lines @@
     if (value == null) {
       compiler.internalError(annotation, 'Annotation value is null.');
       return -1;
     }
     return addGlobalMetadata(
         jsAst.prettyPrint(task.constantReference(value), compiler).getText());
   }
 
   int reifyType(DartType type) {
     jsAst.Expression representation =
-        backend.rti.getTypeRepresentation(type, (variable) {
-          return js.number(
-              task.typeVariableHandler.reifyTypeVariable(variable.element));
-        });
+        backend.rti.getTypeRepresentation(
+            type,
+            (variable) {
+              return js.number(
+                  task.typeVariableHandler.reifyTypeVariable(variable.element));
+            },
+            (TypedefType typedef) {
+              return backend.isAccessibleByReflection(typedef.element);
+            });
 
     return addGlobalMetadata(
         jsAst.prettyPrint(representation, compiler).getText());
   }
 
   int reifyName(String name) {
     return addGlobalMetadata('"$name"');
   }
 
   int addGlobalMetadata(String string) {
@@ skipping 26 matching lines @@
       // TODO(ahe): Why is metadata sometimes null?
       if (link != null) {
         for (; !link.isEmpty; link = link.tail) {
           metadata.add(reifyMetadata(link.head));
         }
       }
       return metadata;
     });
   }
 }