[js-interop] Fix function binding and avoid noSuchMethod when using map notation

test/js/browser_tests.dart

 // Copyright (c) 2012, 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 js_tests;
 
 import 'dart:html';
 
 import 'package:js/js.dart' as js;
 import 'package:unittest/unittest.dart';
@@ skipping 34 matching lines @@
   });
 
   test('read global field with underscore', () {
     js.scoped(() {
       expect(js.context._x, equals(123));
       expect(js.context['_x'], equals(123));
       expect(() => js.context._y, throwsA(isNoSuchMethodError));
     });
   });
 
+  test('js instantiation : new Foo()', () {
+    js.scoped(() {
+      final Foo2 = js.context.container.Foo;
+      final foo = new js.Proxy(Foo2, 42);
+      expect(foo.a, 42);
+      expect(Foo2.b, 38);
+    });
+  });
+
   test('js instantiation : new Array()', () {
     js.scoped(() {
       final a = new js.Proxy(js.context.Array);
       expect(a, isNotNull);
       expect(a.length, equals(0));
 
       a.push("value 1");
       expect(a.length, equals(1));
       expect(a[0], equals("value 1"));
 
@@ skipping 56 matching lines @@
 
   test(r'js instantiation : new RegExp("^\w+$")', () {
     js.scoped(() {
       final a = new js.Proxy(js.context.RegExp, r'^\w+$');
       expect(a, isNotNull);
       expect(a.test('true'), isTrue);
       expect(a.test(' false'), isFalse);
     });
   });
 
+  test('js instantiation via map notation : new Array()', () {
+    js.scoped(() {
+      final a = new js.Proxy(js.context['Array']);
+      expect(a, isNotNull);
+      expect(a['length'], equals(0));
+
+      a['push']("value 1");
+      expect(a['length'], equals(1));
+      expect(a[0], equals("value 1"));
+
+      a['pop']();
+      expect(a['length'], equals(0));
+    });
+  });
+
+  test('js instantiation via map notation : new Date()', () {
+    js.scoped(() {
+      final a = new js.Proxy(js.context['Date']);
+      expect(a['getTime'](), isNotNull);
+    });
+  });
+
   test('js instantiation : typed array', () {
     js.scoped(() {
       final codeUnits = "test".codeUnits;
       final buf = new js.Proxy(js.context.ArrayBuffer, codeUnits.length);
       final bufView = new js.Proxy(js.context.Uint8Array, buf);
       for (var i = 0; i < codeUnits.length; i++) {
         bufView[i] = codeUnits[i];
       }
     });
   });
@@ skipping 13 matching lines @@
     });
   });
 
   test('call JS function', () {
     js.scoped(() {
       expect(js.context.razzle(), equals(42));
       expect(() => js.context.dazzle(), throwsA(isNoSuchMethodError));
     });
   });
 
+  test('call JS function via map notation', () {
+    js.scoped(() {
+      expect(js.context['razzle'](), equals(42));
+      expect(() => js.context['dazzle'](), throwsA(isNoSuchMethodError));
+    });
+  });
+
+  test('call JS function with varargs', () {
+    js.scoped(() {
+      expect(js.context.varArgs(1, 2, 3, 4, 5, 6, 7, 8, 9, 10),
+        equals(55));
+    });
+  });
+
   test('allocate JS object', () {
     js.scoped(() {
       var foo = new js.Proxy(js.context.Foo, 42);
       expect(foo.a, equals(42));
       expect(foo.bar(), equals(42));
       expect(() => foo.baz(), throwsA(isNoSuchMethodError));
     });
   });
 
   test('allocate simple JS array', () {
@@ skipping 285 matching lines @@
   });
 
   test('usage of Serializable', () {
     js.scoped(() {
       final red = Color.RED;
       js.context.color = red;
       expect(js.context.color, equals(red._value));
     });
   });
 }