Add @jsify annotation. Support automatically proxying Lists and Maps to Dart in Proxies. Support co…

test_sources/non_transformed/lib/library.js

 // Copyright (c) 2014, 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.
 
 var foo = new JsThing('made in JS');
 var aString = 'hello';
 var aNum = 123;
 var aBool = true;
 var aDate = new Date(2014, 9, 4);
 var a = null;
 
 function JsThing(name) {
   this.name = name;
   this.bar = null;
 }
 
 JsThing.prototype.double = function(x) {
   return x+x;
 }
 
 JsThing.prototype.getName = function(o) {
   return o.name;
 }
 
 JsThing.prototype.setBar = function(bar) {
   this.bar = bar;
 }
 
+JsThing.prototype.toString = function() {
+  return this.name;
+}
+
 function JsThing2(name) {
   this.name = name;
   this.y = 42;
 }
 
 JsThing2.prototype = new JsThing();
 JsThing2.prototype.constructor = JsThing2;
 
 function createExportMe() {
   return new dart.test.library.ExportMe();
@@ skipping 55 matching lines @@
   e.setter = v;
 }
 
 function roundTrip(e) {
   return e;
 }
 
 function isNull(value) {
   return value === null;
 }