dart2js: mirrors. Support Typedef.reflectedType.

sdk/lib/_internal/compiler/js_lib/js_mirrors.dart

Index: sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart b/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
index 03fc44a4a856083abd3b58843bcd2a84d2027236..84cce8adca940730788478ee26abb92464ad3fde 100644
--- a/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
+++ b/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
@@ -2518,21 +2518,18 @@ class JsTypedefMirror extends JsDeclarationMirror implements TypedefMirror {
 
   bool get hasReflectedType => throw new UnimplementedError();
 
-  Type get reflectedType => throw new UnimplementedError();
+  Type get reflectedType => createRuntimeType(_mangledName);
 
-  // TODO(ahe): Implement this method.
+  // TODO(floitsch): Implement this method.
   List<TypeVariableMirror> get typeVariables => throw new UnimplementedError();
 
-  // TODO(ahe): Implement this method.
-  List<TypeMirror> get typeArguments => throw new UnimplementedError();
+  List<TypeMirror> get typeArguments => const <TypeMirror>[];
 
-  // TODO(ahe): Implement this method.
-  bool get isOriginalDeclaration => throw new UnimplementedError();
+  bool get isOriginalDeclaration => true;
 
-  // TODO(ahe): Implement this method.
-  TypeMirror get originalDeclaration => throw new UnimplementedError();
+  TypeMirror get originalDeclaration => this;
 
-  // TODO(ahe): Implement this method.
+  // TODO(floitsch): Implement this method.
   DeclarationMirror get owner => throw new UnimplementedError();
 
   // TODO(ahe): Implement this method.