Implement modular compilation

test/closure/closure_annotation_test.dart

 // Copyright (c) 2015, 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 dev_compiler.test.closure_annotation_test;
 
 import 'package:test/test.dart';
 
 import 'package:dev_compiler/src/closure/closure_annotation.dart';
-import 'package:dev_compiler/src/js/js_ast.dart' show TypeRef, Identifier;
+import 'package:dev_compiler/src/js_ast/js_ast.dart' show TypeRef, Identifier;
 
 void main() {
   group('ClosureAnnotation', () {
     var anyType = new TypeRef.any();
     var unknownType = new TypeRef.unknown();
     var numberType = new TypeRef.number();
     var stringType = new TypeRef.string();
     var booleanType = new TypeRef.boolean();
     var fooType = new TypeRef.qualified(
         [new Identifier("foo"), new Identifier("Foo")]);
@@ skipping 94 matching lines @@
           ' * @constructor @struct @extends {Bar}\n'
           ' * @implements {Baz}\n'
           ' * @param {string} x\n'
           ' * @param {number} y\n'
           ' * @return {boolean}\n'
           ' * @throws {Bam}\n'
           ' */');
     });
   });
 }