Add display names to controlled components

These show up as Unknown in the DevTools. They also wrap a native component,
so they show up double.

src/dom/components/ReactDOMButton.js

@@ -45,6 +45,8 @@ var mouseListenerNames = keyMirror({
  * when `disabled` is set.
  */
 var ReactDOMButton = ReactCompositeComponent.createClass({
+  displayName: 'ReactDOMButton',
+
   mixins: [AutoFocusMixin],
 
   render: function() {

src/dom/components/ReactDOMForm.js

@@ -33,6 +33,8 @@ var form = ReactDOM.form;
  * composite component and use `componentDidMount` to attach the event handlers.
  */
 var ReactDOMForm = ReactCompositeComponent.createClass({
+  displayName: 'ReactDOMForm',
+
   render: function() {
     // TODO: Instead of using `ReactDOM` directly, we should use JSX. However,
     // `jshint` fails to parse JSX so in order for linting to work in the open

src/dom/components/ReactDOMInput.js

@@ -50,6 +50,8 @@ var instancesByReactID = {};
  * @see http://www.w3.org/TR/2012/WD-html5-20121025/the-input-element.html
  */
 var ReactDOMInput = ReactCompositeComponent.createClass({
+  displayName: 'ReactDOMInput',
+
   mixins: [LinkedValueMixin, AutoFocusMixin],
 
   getInitialState: function() {

src/dom/components/ReactDOMOption.js

@@ -28,6 +28,7 @@ var option = ReactDOM.option;
  * Implements an <option> native component that warns when `selected` is set.
  */
 var ReactDOMOption = ReactCompositeComponent.createClass({
+  displayName: 'ReactDOMOption',
 
   componentWillMount: function() {
     // TODO (yungsters): Remove support for `selected` in <option>.

src/dom/components/ReactDOMSelect.js

@@ -100,6 +100,8 @@ function updateOptions() {
  * selected.
  */
 var ReactDOMSelect = ReactCompositeComponent.createClass({
+  displayName: 'ReactDOMSelect',
+
   mixins: [LinkedValueMixin, AutoFocusMixin],
 
   propTypes: {

src/dom/components/ReactDOMTextarea.js

@@ -46,6 +46,8 @@ var textarea = ReactDOM.textarea;
  * `defaultValue` if specified, or the children content (deprecated).
  */
 var ReactDOMTextarea = ReactCompositeComponent.createClass({
+  displayName: 'ReactDOMTextarea',
+
   mixins: [LinkedValueMixin, AutoFocusMixin],
 
   getInitialState: function() {