Store Typedef(s) in kernel when parsing with Fasta, deserilize in DillLibraryBuilder.

pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart

Index: pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
new file mode 100644
index 0000000000000000000000000000000000000000..07c66c998ab83f35e30e561acb445f124789bba8
--- /dev/null
+++ b/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
@@ -0,0 +1,47 @@
+// Copyright (c) 2017, 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.
+
+library fasta.dill_typedef_builder;
+
+import 'package:front_end/src/fasta/builder/library_builder.dart';
+import 'package:front_end/src/fasta/errors.dart';
+import 'package:kernel/ast.dart' show DartType, Typedef;
+
+import '../kernel/kernel_builder.dart'
+    show
+        FormalParameterBuilder,
+        KernelFunctionTypeAliasBuilder,
+        KernelTypeBuilder,
+        MetadataBuilder,
+        TypeVariableBuilder;
+import 'dill_library_builder.dart' show DillLibraryBuilder;
+
+class DillFunctionTypeAliasBuilder extends KernelFunctionTypeAliasBuilder {
+  final Typedef typedef;
+
+  DillFunctionTypeAliasBuilder(this.typedef, DillLibraryBuilder parent)
+      : super(null, null, typedef.name, null, null, parent, typedef.fileOffset);
+
+  @override
+  List<FormalParameterBuilder> get formals {
+    return internalError('Not implemented.');
+  }
+
+  List<MetadataBuilder> get metadata {
+    return internalError('Not implemented.');
+  }
+
+  @override
+  KernelTypeBuilder get returnType {
+    return internalError('Not implemented.');
+  }
+
+  @override
+  List<TypeVariableBuilder> get typeVariables {
+    return internalError('Not implemented.');
+  }
+
+  @override
+  DartType buildThisType(LibraryBuilder library) => typedef.type;
+}