Add --modules=node support

lib/runtime/dart/_isolate_helper.js

Index: lib/runtime/dart/_isolate_helper.js
diff --git a/lib/runtime/dart/_isolate_helper.js b/lib/runtime/dart/_isolate_helper.js
index 66f9733ac19daa0e2d20d8b771b7cd8b504b2fce..520359e249c3d4301204935efe5f34a00956f063 100644
--- a/lib/runtime/dart/_isolate_helper.js
+++ b/lib/runtime/dart/_isolate_helper.js
@@ -10,7 +10,7 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
 ], /* Lazy imports */[
   'dart/_native_typed_data',
   'dart/_js_embedded_names'
-], function(exports, dart, core, _interceptors, _js_helper, isolate, _foreign_helper, collection, async, _native_typed_data, _js_embedded_names) {
+], function(exports, dart, core, _interceptors, _js_helper, isolate, _foreign_helper, collection, $async, _native_typed_data, _js_embedded_names) {
   'use strict';
   let dartx = dart.dartx;
   function _serializeMessage(message) {
@@ -830,7 +830,7 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
       if (exports.globalWindow != null) {
         const next = (function() {
           if (!dart.notNull(this.runIteration())) return;
-          async.Timer.run(next);
+          $async.Timer.run(next);
         }).bind(this);
         dart.fn(next);
         next();
@@ -1069,7 +1069,7 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
         uri = dart.notNull(uri) + ".js";
       }
       let port = isolate.ReceivePort.new();
-      let completer = async.Completer$(core.List).new();
+      let completer = $async.Completer$(core.List).new();
       port.first.then(dart.fn(msg => {
         if (dart.equals(dart.dindex(msg, 0), _SPAWNED_SIGNAL)) {
           completer.complete(msg);
@@ -1182,9 +1182,9 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
       _getJSFunctionFromName: [dart.dynamic, [core.String]],
       _getJSFunctionName: [core.String, [core.Function]],
       _allocate: [dart.dynamic, [dart.dynamic]],
-      spawnFunction: [async.Future$(core.List), [dart.functionType(dart.void, [dart.dynamic]), dart.dynamic, core.bool]],
-      spawnUri: [async.Future$(core.List), [core.Uri, core.List$(core.String), dart.dynamic, core.bool]],
-      spawn: [async.Future$(core.List), [core.String, core.String, core.List$(core.String), dart.dynamic, core.bool, core.bool, core.bool]],
+      spawnFunction: [$async.Future$(core.List), [dart.functionType(dart.void, [dart.dynamic]), dart.dynamic, core.bool]],
+      spawnUri: [$async.Future$(core.List), [core.Uri, core.List$(core.String), dart.dynamic, core.bool]],
+      spawn: [$async.Future$(core.List), [core.String, core.String, core.List$(core.String), dart.dynamic, core.bool, core.bool, core.bool]],
       _startWorker: [dart.void, [core.String, core.String, core.List$(core.String), dart.dynamic, core.bool, core.bool, isolate.SendPort, dart.functionType(dart.void, [core.String])]],
       _startNonWorker: [dart.void, [core.String, core.String, core.List$(core.String), dart.dynamic, core.bool, core.bool, isolate.SendPort]],
       _startIsolate: [dart.void, [core.Function, core.List$(core.String), dart.dynamic, core.bool, core.bool, isolate.SendPort]],
@@ -1348,7 +1348,7 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
   RawReceivePortImpl._nextFreeId = 1;
   const _rawPort = Symbol('_rawPort');
   const _controller = Symbol('_controller');
-  class ReceivePortImpl extends async.Stream {
+  class ReceivePortImpl extends $async.Stream {
     ReceivePortImpl() {
       this.fromRawReceivePort(new RawReceivePortImpl(null));
     }
@@ -1359,7 +1359,7 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
       this[_rawPort] = rawPort;
       this[_controller] = null;
       super.Stream();
-      this[_controller] = async.StreamController.new({onCancel: dart.bind(this, 'close'), sync: true});
+      this[_controller] = $async.StreamController.new({onCancel: dart.bind(this, 'close'), sync: true});
       this[_rawPort].handler = dart.bind(this[_controller], 'add');
     }
     listen(onData, opts) {
@@ -1386,7 +1386,7 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
       fromRawReceivePort: [ReceivePortImpl, [isolate.RawReceivePort]]
     }),
     methods: () => ({
-      listen: [async.StreamSubscription, [dart.functionType(dart.void, [dart.dynamic])], {onError: core.Function, onDone: dart.functionType(dart.void, []), cancelOnError: core.bool}],
+      listen: [$async.StreamSubscription, [dart.functionType(dart.void, [dart.dynamic])], {onError: core.Function, onDone: dart.functionType(dart.void, []), cancelOnError: core.bool}],
       close: [dart.void, []]
     })
   });
@@ -1455,12 +1455,12 @@ dart_library.library('dart/_isolate_helper', null, /* Imports */[
       return this[_handle] != null;
     }
   }
-  TimerImpl[dart.implements] = () => [async.Timer];
+  TimerImpl[dart.implements] = () => [$async.Timer];
   dart.defineNamedConstructor(TimerImpl, 'periodic');
   dart.setSignature(TimerImpl, {
     constructors: () => ({
       TimerImpl: [TimerImpl, [core.int, dart.functionType(dart.void, [])]],
-      periodic: [TimerImpl, [core.int, dart.functionType(dart.void, [async.Timer])]]
+      periodic: [TimerImpl, [core.int, dart.functionType(dart.void, [$async.Timer])]]
     }),
     methods: () => ({cancel: [dart.void, []]})
   });