First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/static_closure_test.dart

Index: tests/compiler/dart2js/static_closure_test.dart
diff --git a/tests/compiler/dart2js/static_closure_test.dart b/tests/compiler/dart2js/static_closure_test.dart
index 4003c61f2a73a0ed95a7c078fede24179960294b..b929d27af88c01dca6cbbf0a202abf74506e9d22 100644
--- a/tests/compiler/dart2js/static_closure_test.dart
+++ b/tests/compiler/dart2js/static_closure_test.dart
@@ -8,14 +8,15 @@ import "package:expect/expect.dart";
 import 'compiler_helper.dart';
 
 main() {
-  String code = compileAll(r'''main() { print(main); }''');
+  compileAll(r'''main() { print(main); }''').then((code) {
+    // At some point, we will have to closurize global functions
+    // differently, at which point this test will break. Then it is time
+    // to implement a way to call a Dart closure from JS foreign
+    // functions.
 
-  // At some point, we will have to closurize global functions
-  // differently, at which point this test will break. Then it is time
-  // to implement a way to call a Dart closure from JS foreign
-  // functions.
-
-  // If this test fail, please take a look at the use of
-  // toStringWrapper in captureStackTrace in js_helper.dart.
-  Expect.isTrue(code.contains(new RegExp(r'print\([$a-z]+\.main\$closure\);')));
+    // If this test fail, please take a look at the use of
+    // toStringWrapper in captureStackTrace in js_helper.dart.
+    Expect.isTrue(code.contains(
+        new RegExp(r'print\([$a-z]+\.main\$closure\);')));
+  });
 }