Add --modules=node support

lib/runtime/dart/isolate.js

Index: lib/runtime/dart/isolate.js
diff --git a/lib/runtime/dart/isolate.js b/lib/runtime/dart/isolate.js
index 4f86926938799658bce99d1a4a496b0e79b4c3f9..e706355941c31aca64265280f9dd3568653b3cb1 100644
--- a/lib/runtime/dart/isolate.js
+++ b/lib/runtime/dart/isolate.js
@@ -4,7 +4,7 @@ dart_library.library('dart/isolate', null, /* Imports */[
   'dart/async'
 ], /* Lazy imports */[
   'dart/_isolate_helper'
-], function(exports, dart, core, async, _isolate_helper) {
+], function(exports, dart, core, $async, _isolate_helper) {
   'use strict';
   let dartx = dart.dartx;
   class Capability extends core.Object {
@@ -45,7 +45,7 @@ dart_library.library('dart/isolate', null, /* Imports */[
         return _isolate_helper.IsolateNatives.spawnFunction(entryPoint, message, paused).then(dart.fn(msg => new Isolate(dart.as(msg[dartx.get](1), SendPort), {pauseCapability: dart.as(msg[dartx.get](2), Capability), terminateCapability: dart.as(msg[dartx.get](3), Capability)}), Isolate, [core.List]));
       } catch (e) {
         let st = dart.stackTrace(e);
-        return async.Future$(Isolate).error(e, st);
+        return $async.Future$(Isolate).error(e, st);
       }
 
     }
@@ -66,7 +66,7 @@ dart_library.library('dart/isolate', null, /* Imports */[
         return _isolate_helper.IsolateNatives.spawnUri(uri, args, message, paused).then(dart.fn(msg => new Isolate(dart.as(msg[dartx.get](1), SendPort), {pauseCapability: dart.as(msg[dartx.get](2), Capability), terminateCapability: dart.as(msg[dartx.get](3), Capability)}), Isolate, [core.List]));
       } catch (e) {
         let st = dart.stackTrace(e);
-        return async.Future$(Isolate).error(e, st);
+        return $async.Future$(Isolate).error(e, st);
       }
 
     }
@@ -142,7 +142,7 @@ dart_library.library('dart/isolate', null, /* Imports */[
         controller.addError(error, error.stackTrace);
       }
       dart.fn(handleError, dart.void, [dart.dynamic]);
-      controller = async.StreamController.broadcast({sync: true, onListen: dart.fn((() => {
+      controller = $async.StreamController.broadcast({sync: true, onListen: dart.fn((() => {
           port = RawReceivePort.new(handleError);
           this.addErrorListener(port.sendPort);
         }).bind(this), dart.void, []), onCancel: dart.fn((() => {
@@ -168,8 +168,8 @@ dart_library.library('dart/isolate', null, /* Imports */[
       removeErrorListener: [dart.void, [SendPort]]
     }),
     statics: () => ({
-      spawn: [async.Future$(Isolate), [dart.functionType(dart.void, [dart.dynamic]), dart.dynamic], {paused: core.bool}],
-      spawnUri: [async.Future$(Isolate), [core.Uri, core.List$(core.String), dart.dynamic], {paused: core.bool, packageRoot: core.Uri}]
+      spawn: [$async.Future$(Isolate), [dart.functionType(dart.void, [dart.dynamic]), dart.dynamic], {paused: core.bool}],
+      spawnUri: [$async.Future$(Isolate), [core.Uri, core.List$(core.String), dart.dynamic], {paused: core.bool, packageRoot: core.Uri}]
     }),
     names: ['spawn', 'spawnUri']
   });
@@ -191,7 +191,7 @@ dart_library.library('dart/isolate', null, /* Imports */[
       return new _isolate_helper.ReceivePortImpl.fromRawReceivePort(rawPort);
     }
   }
-  ReceivePort[dart.implements] = () => [async.Stream];
+  ReceivePort[dart.implements] = () => [$async.Stream];
   dart.setSignature(ReceivePort, {
     constructors: () => ({
       new: [ReceivePort, []],