Add --modules=node support

lib/runtime/dart/html_common.js

 dart_library.library('dart/html_common', null, /* Imports */[
   'dart/_runtime',
   'dart/_metadata',
   'dart/core',
   'dart/html',
   'dart/typed_data',
   'dart/_js_helper',
   'dart/_native_typed_data',
   'dart/async',
   'dart/collection',
   'dart/_internal'
 ], /* Lazy imports */[
-], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, async, collection, _internal) {
+], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, $async, collection, _internal) {
   'use strict';
   let dartx = dart.dartx;
   dart.export(exports, _metadata);
   const _validateToken = Symbol('_validateToken');
   class CssClassSetImpl extends core.Object {
     [_validateToken](value) {
       if (dart.notNull(CssClassSetImpl._validTokenRE.hasMatch(value))) return value;
       dart.throw(new core.ArgumentError.value(value, 'value', 'Not a valid class token'));
     }
     toString() {
@@ skipping 578 matching lines @@
   dart.fn(isJavaScriptSimpleObject, core.bool, [dart.dynamic]);
   function isImmutableJavaScriptArray(value) {
     return !!value.immutable$list;
   }
   dart.fn(isImmutableJavaScriptArray, core.bool, [dart.dynamic]);
   function isJavaScriptPromise(value) {
     return typeof Promise != "undefined" && value instanceof Promise;
   }
   dart.fn(isJavaScriptPromise, core.bool, [dart.dynamic]);
   function convertNativePromiseToDartFuture(promise) {
-    let completer = async.Completer.new();
+    let completer = $async.Completer.new();
     let then = dart.dcall(/* Unimplemented unknown name */convertDartClosureToJS, dart.fn(result => completer.complete(result), dart.void, [dart.dynamic]), 1);
     let error = dart.dcall(/* Unimplemented unknown name */convertDartClosureToJS, dart.fn(result => completer.completeError(result), dart.void, [dart.dynamic]), 1);
     let newPromise = promise.then(then).catch(error);
     return completer.future;
   }
-  dart.fn(convertNativePromiseToDartFuture, async.Future, [dart.dynamic]);
+  dart.fn(convertNativePromiseToDartFuture, $async.Future, [dart.dynamic]);
   class Device extends core.Object {
     static get userAgent() {
       return dart.as(dart.dload(html.window.navigator.raw, 'userAgent'), core.String);
     }
     static get isOpera() {
       if (Device._isOpera == null) {
         Device._isOpera = Device.userAgent[dartx.contains]("Opera", 0);
       }
       return Device._isOpera;
     }
@@ skipping 292 matching lines @@
   exports.isJavaScriptArray = isJavaScriptArray;
   exports.isJavaScriptSimpleObject = isJavaScriptSimpleObject;
   exports.isImmutableJavaScriptArray = isImmutableJavaScriptArray;
   exports.isJavaScriptPromise = isJavaScriptPromise;
   exports.convertNativePromiseToDartFuture = convertNativePromiseToDartFuture;
   exports.Device = Device;
   exports.FilteredElementList = FilteredElementList;
   exports.Lists = Lists;
   exports.NodeListWrapper = NodeListWrapper;
 });