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

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

 // Copyright (c) 2016, 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_library_builder;
 
+import 'package:front_end/src/fasta/dill/dill_typedef_builder.dart';
 import 'package:kernel/ast.dart'
     show
         Class,
         ExpressionStatement,
         Field,
         FunctionNode,
         Let,
         Library,
         ListLiteral,
         Member,
         Procedure,
-        StaticGet;
+        StaticGet,
+        Typedef;
 
 import '../errors.dart' show internalError;
 
 import '../kernel/kernel_builder.dart'
     show
         Builder,
         KernelInvalidTypeBuilder,
         KernelTypeBuilder,
         LibraryBuilder,
         Scope;
@@ skipping 68 matching lines @@
     if (!name.startsWith("_")) {
       if (isSetter) {
         exportScopeBuilder.addSetter(name, builder);
       } else {
         exportScopeBuilder.addMember(name, builder);
       }
     }
     return builder;
   }
 
+  void addTypedef(Typedef typedef) {
+    var typedefBuilder = new DillFunctionTypeAliasBuilder(typedef, this);
+    addBuilder(typedef.name, typedefBuilder, typedef.fileOffset);
+  }
+
   bool addToExportScope(String name, Builder member) {
     return internalError("Not implemented yet.");
   }
 
   @override
   void addToScope(String name, Builder member, int charOffset, bool isImport) {
     internalError("Not implemented yet.");
   }
 
   @override
   Builder buildAmbiguousBuilder(
       String name, Builder builder, Builder other, int charOffset,
       {bool isExport: false, bool isImport: false}) {
     return new KernelInvalidTypeBuilder(name, charOffset, fileUri);
   }
 
   @override
   String get fullNameForErrors {
     return library.name ?? "<library '${library.fileUri}'>";
   }
 }