First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/simple_inferrer_closure_test.dart

Index: tests/compiler/dart2js/simple_inferrer_closure_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_closure_test.dart b/tests/compiler/dart2js/simple_inferrer_closure_test.dart
index 23d6db0a59ac38aa9c6d606e33263e76f7568e60..7ad5e58a5805557da9e741956803d57b92614b8f 100644
--- a/tests/compiler/dart2js/simple_inferrer_closure_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_closure_test.dart
@@ -82,23 +82,24 @@ main() {
 void main() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
-  compiler.runCompiler(uri);
-  var typesInferrer = compiler.typesTask.typesInferrer;
+  compiler.runCompiler(uri).then((_) {
+    var typesInferrer = compiler.typesTask.typesInferrer;
 
-  checkReturn(String name, type) {
-    var element = findElement(compiler, name);
-    Expect.equals(type, typesInferrer.internal.returnTypeOf[element]);
-  }
+    checkReturn(String name, type) {
+      var element = findElement(compiler, name);
+      Expect.equals(type, typesInferrer.internal.returnTypeOf[element]);
+    }
 
-  checkReturn('returnInt1', typesInferrer.intType);
-  // TODO(ngeoffray): We don't use types of mutated captured
-  // variables anymore, because they could lead to optimistic results
-  // needing to be re-analyzed.
-  checkReturn('returnInt2', typesInferrer.dynamicType);
-  checkReturn('returnInt3', typesInferrer.intType);
-  checkReturn('returnInt4', typesInferrer.intType);
+    checkReturn('returnInt1', typesInferrer.intType);
+    // TODO(ngeoffray): We don't use types of mutated captured
+    // variables anymore, because they could lead to optimistic results
+    // needing to be re-analyzed.
+    checkReturn('returnInt2', typesInferrer.dynamicType);
+    checkReturn('returnInt3', typesInferrer.intType);
+    checkReturn('returnInt4', typesInferrer.intType);
 
-  checkReturn('returnDyn1', typesInferrer.dynamicType);
-  checkReturn('returnDyn2', typesInferrer.dynamicType);
-  checkReturn('returnDyn3', typesInferrer.dynamicType);
+    checkReturn('returnDyn1', typesInferrer.dynamicType);
+    checkReturn('returnDyn2', typesInferrer.dynamicType);
+    checkReturn('returnDyn3', typesInferrer.dynamicType);
+  });
 }