First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/simple_inferrer_postfix_prefix_test.dart

Index: tests/compiler/dart2js/simple_inferrer_postfix_prefix_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_postfix_prefix_test.dart b/tests/compiler/dart2js/simple_inferrer_postfix_prefix_test.dart
index cfae3a72e89cbf8af8bfe06089c2395e1d71b518..d6bff7cb99c050465f05ed873fecb0b8aaabdb1f 100644
--- a/tests/compiler/dart2js/simple_inferrer_postfix_prefix_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_postfix_prefix_test.dart
@@ -13,7 +13,7 @@ class A {
   set foo(value) {}
   operator[](index) => 'string';
   operator[]=(index, value) {}
-  
+
   returnDynamic1() => foo--;
   returnNum1() => --foo;
   returnNum2() => foo -= 42;
@@ -63,33 +63,34 @@ main() {
 void main() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
-  compiler.runCompiler(uri);
-  var typesInferrer = compiler.typesTask.typesInferrer;
-
-  checkReturnInClass(String className, String methodName, type) {
-    var cls = findElement(compiler, className);
-    var element = cls.lookupLocalMember(buildSourceString(methodName));
-    Expect.equals(type,
-        typesInferrer.internal.returnTypeOf[element].simplify(compiler));
-  }
-
-  var subclassOfInterceptor =
-      findTypeMask(compiler, 'Interceptor', 'nonNullSubclass');
-
-  checkReturnInClass('A', 'returnNum1', typesInferrer.numType);
-  checkReturnInClass('A', 'returnNum2', typesInferrer.numType);
-  checkReturnInClass('A', 'returnNum3', typesInferrer.numType);
-  checkReturnInClass('A', 'returnNum4', typesInferrer.numType);
-  checkReturnInClass('A', 'returnNum5', typesInferrer.numType);
-  checkReturnInClass('A', 'returnNum6', typesInferrer.numType);
-  checkReturnInClass('A', 'returnDynamic1', subclassOfInterceptor);
-  checkReturnInClass('A', 'returnDynamic2', subclassOfInterceptor);
-  checkReturnInClass('A', 'returnDynamic3', typesInferrer.dynamicType);
-
-  checkReturnInClass('B', 'returnString1', typesInferrer.stringType);
-  checkReturnInClass('B', 'returnString2', typesInferrer.stringType);
-  checkReturnInClass('B', 'returnDynamic1', typesInferrer.dynamicType);
-  checkReturnInClass('B', 'returnDynamic2', typesInferrer.dynamicType);
-  checkReturnInClass('B', 'returnDynamic3', typesInferrer.dynamicType);
-  checkReturnInClass('B', 'returnDynamic4', typesInferrer.dynamicType);
+  compiler.runCompiler(uri).then((_) {
+    var typesInferrer = compiler.typesTask.typesInferrer;
+
+    checkReturnInClass(String className, String methodName, type) {
+      var cls = findElement(compiler, className);
+      var element = cls.lookupLocalMember(buildSourceString(methodName));
+      Expect.equals(type,
+          typesInferrer.internal.returnTypeOf[element].simplify(compiler));
+    }
+
+    var subclassOfInterceptor =
+        findTypeMask(compiler, 'Interceptor', 'nonNullSubclass');
+
+    checkReturnInClass('A', 'returnNum1', typesInferrer.numType);
+    checkReturnInClass('A', 'returnNum2', typesInferrer.numType);
+    checkReturnInClass('A', 'returnNum3', typesInferrer.numType);
+    checkReturnInClass('A', 'returnNum4', typesInferrer.numType);
+    checkReturnInClass('A', 'returnNum5', typesInferrer.numType);
+    checkReturnInClass('A', 'returnNum6', typesInferrer.numType);
+    checkReturnInClass('A', 'returnDynamic1', subclassOfInterceptor);
+    checkReturnInClass('A', 'returnDynamic2', subclassOfInterceptor);
+    checkReturnInClass('A', 'returnDynamic3', typesInferrer.dynamicType);
+
+    checkReturnInClass('B', 'returnString1', typesInferrer.stringType);
+    checkReturnInClass('B', 'returnString2', typesInferrer.stringType);
+    checkReturnInClass('B', 'returnDynamic1', typesInferrer.dynamicType);
+    checkReturnInClass('B', 'returnDynamic2', typesInferrer.dynamicType);
+    checkReturnInClass('B', 'returnDynamic3', typesInferrer.dynamicType);
+    checkReturnInClass('B', 'returnDynamic4', typesInferrer.dynamicType);
+  });
 }