First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/list_tracer_node_type_test.dart

Index: tests/compiler/dart2js/list_tracer_node_type_test.dart
diff --git a/tests/compiler/dart2js/list_tracer_node_type_test.dart b/tests/compiler/dart2js/list_tracer_node_type_test.dart
index ad06034b92ae3b0ba553d8598d4b82747f0e7aec..4ab9e4ab9cc9d878d2719a56504bdd599d36d4cc 100644
--- a/tests/compiler/dart2js/list_tracer_node_type_test.dart
+++ b/tests/compiler/dart2js/list_tracer_node_type_test.dart
@@ -39,22 +39,26 @@ main() {
 
 
 main() {
-  String generated = compileAll(TEST1);
-  // Check that we only do a null check on the receiver for
-  // [: a[0] + 42 :]. We can do a null check because we inferred that
-  // the list is of type int or null.
-  Expect.isFalse(generated.contains('if (typeof t1'));
-  Expect.isTrue(generated.contains('if (t1 == null)'));
-
-  generated = compileAll(TEST2);
-  Expect.isFalse(generated.contains('if (typeof t1'));
-  Expect.isTrue(generated.contains('if (t1 == null)'));
-
-  generated = compileAll(TEST3);
-  Expect.isFalse(generated.contains('if (typeof t1'));
-  Expect.isTrue(generated.contains('if (t1 == null)'));
-
-  generated = compileAll(TEST4);
-  Expect.isFalse(generated.contains('if (typeof t1'));
-  Expect.isTrue(generated.contains('if (t1 == null)'));
+  compileAll(TEST1).then((generated) {
+    // Check that we only do a null check on the receiver for
+    // [: a[0] + 42 :]. We can do a null check because we inferred that
+    // the list is of type int or null.
+    Expect.isFalse(generated.contains('if (typeof t1'));
+    Expect.isTrue(generated.contains('if (t1 == null)'));
+  });
+
+  compileAll(TEST2).then((generated) {
+    Expect.isFalse(generated.contains('if (typeof t1'));
+    Expect.isTrue(generated.contains('if (t1 == null)'));
+  });
+
+  compileAll(TEST3).then((generated) {
+    Expect.isFalse(generated.contains('if (typeof t1'));
+    Expect.isTrue(generated.contains('if (t1 == null)'));
+  });
+
+  compileAll(TEST4).then((generated) {
+    Expect.isFalse(generated.contains('if (typeof t1'));
+    Expect.isTrue(generated.contains('if (t1 == null)'));
+  });
 }