dart2js: support isolates in the startup-emitter.

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
index 9dc93dc59f6c2800881caa1e1ad7333e2376836b..42d0e005c91a4693a389ae29d475bdfea09e9034 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart
@@ -400,6 +400,13 @@ class Emitter implements js_emitter.Emitter {
             generateEmbeddedGlobalAccessString(embeddedNames.TYPES);
         return jsAst.js.expressionTemplateFor("$typesAccess[#]");
 
+      case JsBuiltin.createDartClosureFromNameOfStaticFunction:
+        // The global-functions map contains a map from name to tear-off
+        // getters.
+        String functionGettersMap =
+            generateEmbeddedGlobalAccessString(embeddedNames.GLOBAL_FUNCTIONS);
+        return jsAst.js.expressionTemplateFor("$functionGettersMap[#]()");
+
       default:
         compiler.internalError(NO_LOCATION_SPANNABLE,
             "Unhandled Builtin: $builtin");