First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/simple_inferrer_try_catch_test.dart

Index: tests/compiler/dart2js/simple_inferrer_try_catch_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_try_catch_test.dart b/tests/compiler/dart2js/simple_inferrer_try_catch_test.dart
index 917ffe95f983958017d3a39cdc786a80158ab91d..a885fd0fe262895cd6971f1405809ca485b1f48e 100644
--- a/tests/compiler/dart2js/simple_inferrer_try_catch_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_try_catch_test.dart
@@ -156,30 +156,31 @@ 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].simplify(compiler));
-  }
+    checkReturn(String name, type) {
+      var element = findElement(compiler, name);
+      Expect.equals(type,
+          typesInferrer.internal.returnTypeOf[element].simplify(compiler));
+    }
 
-  checkReturn('returnInt1', typesInferrer.intType);
-  checkReturn('returnInt2', typesInferrer.intType);
-  checkReturn('returnInt3', typesInferrer.intType);
-  checkReturn('returnInt4', typesInferrer.intType);
-  checkReturn('returnInt5', typesInferrer.intType);
-  checkReturn('returnInt6',
-      new TypeMask.nonNullSubtype(compiler.intClass.rawType));
-
-  var subclassOfInterceptor =
-      findTypeMask(compiler, 'Interceptor', 'nonNullSubclass');
-
-  checkReturn('returnDyn1', subclassOfInterceptor);
-  checkReturn('returnDyn2', subclassOfInterceptor);
-  checkReturn('returnDyn3', subclassOfInterceptor);
-  checkReturn('returnDyn4', subclassOfInterceptor);
-  checkReturn('returnDyn5', subclassOfInterceptor);
-  checkReturn('returnDyn6', typesInferrer.dynamicType);
+    checkReturn('returnInt1', typesInferrer.intType);
+    checkReturn('returnInt2', typesInferrer.intType);
+    checkReturn('returnInt3', typesInferrer.intType);
+    checkReturn('returnInt4', typesInferrer.intType);
+    checkReturn('returnInt5', typesInferrer.intType);
+    checkReturn('returnInt6',
+        new TypeMask.nonNullSubtype(compiler.intClass.rawType));
+
+    var subclassOfInterceptor =
+        findTypeMask(compiler, 'Interceptor', 'nonNullSubclass');
+
+    checkReturn('returnDyn1', subclassOfInterceptor);
+    checkReturn('returnDyn2', subclassOfInterceptor);
+    checkReturn('returnDyn3', subclassOfInterceptor);
+    checkReturn('returnDyn4', subclassOfInterceptor);
+    checkReturn('returnDyn5', subclassOfInterceptor);
+    checkReturn('returnDyn6', typesInferrer.dynamicType);
+  });
 }