[mdv] Implement two-way binding to HTMLTextArea.value

pkg/mdv/lib/mdv.dart

 // Copyright (c) 2013, 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.
 
 // TODO(jmesserly): more commentary here.
 /**
  * This library provides access to Model-Driven-Views APIs on HTML elements.
  * More information can be found at: <https://github.com/toolkitchen/mdv>.
  */
 library mdv;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:math' as math;
 import 'package:observe/observe.dart';
 
 // TODO(jmesserly): get this from somewhere else. See http://dartbug.com/4161.
 import 'package:serialization/src/serialization_helpers.dart' show IdentityMap;
 
-part 'src/bindings.dart';
 part 'src/element.dart';
+part 'src/input_bindings.dart';
 part 'src/input_element.dart';
 part 'src/node.dart';
 part 'src/select_element.dart';
 part 'src/template.dart';
+part 'src/template_iterator.dart';
 part 'src/text.dart';
+part 'src/text_area_element.dart';
 
 /** Initialize the Model-Driven Views polyfill. */
 void initialize() {
   TemplateElement.mdvPackage = _mdv;
 }
 
 StreamController<DocumentFragment> _instanceCreated;
 
 /**
  * *Warning*: This is an implementation helper for Model-Driven Views and
@@ skipping 41 matching lines @@
 final Expando _mdvExpando = new Expando('mdv');
 
 _mdv(node) {
   var wrapper = _mdvExpando[node];
   if (wrapper != null) return wrapper;
 
   if (node is InputElement) {
     wrapper = new _InputElementExtension(node);
   } else if (node is SelectElement) {
     wrapper = new _SelectElementExtension(node);
+  } else if (node is TextAreaElement) {
+    wrapper = new _TextAreaElementExtension(node);
   } else if (node is Element) {
     if (node.isTemplate) {
       wrapper = new _TemplateExtension(node);
     } else {
       wrapper = new _ElementExtension(node);
     }
   } else if (node is Text) {
     wrapper = new _TextExtension(node);
   } else if (node is Node) {
     wrapper = new _NodeExtension(node);
   } else {
     // TODO(jmesserly): this happens for things like CompoundBinding.
     wrapper = node;
   }
 
   _mdvExpando[node] = wrapper;
   return wrapper;
 }