Support Timer with 0 millisecond delay in dart2js running in the command line.

sdk/lib/_internal/compiler/implementation/enqueue.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js;
 
 class EnqueueTask extends CompilerTask {
   final ResolutionEnqueuer resolution;
   final CodegenEnqueuer codegen;
 
@@ skipping 396 matching lines @@
       elements = getCachedElements(element);
     }
     compiler.world.registerUsedElement(element);
 
     if (elements == null) {
       queue.add(
           new ResolutionWorkItem(element, itemCompilationContextCreator()));
     }
 
     // Enable isolate support if we start using something from the
     // isolate library.

[kasperl, 2013/01/11 11:58:08]

or if we use timers from the dart:async library.

[ngeoffray, 2013/01/11 12:20:19]

Done.

     LibraryElement library = element.getLibrary();
-    if (!compiler.hasIsolateSupport()
-        && library.uri.toString() == 'dart:isolate') {
-      enableIsolateSupport(library);
+    if (!compiler.hasIsolateSupport()) {
+      String uri = library.uri.toString();
+      if (uri == 'dart:isolate') {
+        enableIsolateSupport(library);
+      } else if (uri == 'dart:async') {
+        ClassElement cls = element.getEnclosingClass();
+        if (cls != null && cls.name == const SourceString('Timer')) {
+          // The [:Timer:] class uses the event queue of the isolate
+          // library, so we make sure that event queue is generated.
+          enableIsolateSupport(library);
+        }
+      }
     }
 
     return true;
   }
 
   void enableIsolateSupport(LibraryElement element) {
     compiler.isolateLibrary = element.patch;
     addToWorkList(
         compiler.isolateHelperLibrary.find(Compiler.START_ROOT_ISOLATE));
     addToWorkList(compiler.isolateHelperLibrary.find(
@@ skipping 111 matching lines @@
     while(!queue.isEmpty) {
       // TODO(johnniwinther): Find an optimal process order for codegen.
       f(queue.removeLast());
     }
   }
 
   void _logSpecificSummary(log(message)) {
     log('Compiled ${universe.generatedCode.length} methods.');
   }
 }