First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart

Index: tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart b/tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart
index 0d015589a6c4e17679d175644461c3bff122a20e..256012c9be54548b1aeaf254d2b40ba93e134f40 100644
--- a/tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart
@@ -95,11 +95,7 @@ main() {
 main() {
   Uri uri = new Uri(scheme: 'source');
 
-  var compiler = compilerFor(TEST1, uri);
-  compiler.runCompiler(uri);
-  var typesInferrer = compiler.typesTask.typesInferrer;
-
-  checkReturn(String name, type) {
+  checkReturn(MockCompiler compiler, typesInferrer, String name, type) {
     var element = findElement(compiler, name);
     Expect.equals(
         type,
@@ -107,27 +103,37 @@ main() {
         name);
   }
 
-  checkReturn('test1', typesInferrer.intType);
-  checkReturn('test2', typesInferrer.dynamicType.nonNullable());
-  checkReturn('test3', typesInferrer.intType);
-  checkReturn('test4', typesInferrer.mapType);
-  checkReturn('test5', typesInferrer.dynamicType.nonNullable());
-  checkReturn('test6', typesInferrer.dynamicType.nonNullable());
-
-  compiler = compilerFor(TEST2, uri);
-  compiler.runCompiler(uri);
-  typesInferrer = compiler.typesTask.typesInferrer;
-
-  checkReturn('test1', typesInferrer.dynamicType.nonNullable());
-  checkReturn('test2', typesInferrer.mapType);
-  checkReturn('test3', typesInferrer.mapType);
-  checkReturn('test4', typesInferrer.mapType);
-  checkReturn('test5', typesInferrer.mapType);
-
-  checkReturn('test6', typesInferrer.numType);
-  checkReturn('test7', typesInferrer.intType);
-  checkReturn('test8', typesInferrer.intType);
-  checkReturn('test9', typesInferrer.intType);
-  checkReturn('test10', typesInferrer.numType);
-  checkReturn('test11', typesInferrer.doubleType);
+  var compiler1 = compilerFor(TEST1, uri);
+  compiler1.runCompiler(uri).then((_) {
+    var typesInferrer = compiler1.typesTask.typesInferrer;
+
+    checkReturn(compiler1, typesInferrer, 'test1', typesInferrer.intType);
+    checkReturn(compiler1, typesInferrer, 'test2',
+        typesInferrer.dynamicType.nonNullable());
+    checkReturn(compiler1, typesInferrer, 'test3', typesInferrer.intType);
+    checkReturn(compiler1, typesInferrer, 'test4', typesInferrer.mapType);
+    checkReturn(compiler1, typesInferrer, 'test5',
+        typesInferrer.dynamicType.nonNullable());
+    checkReturn(compiler1, typesInferrer, 'test6',
+        typesInferrer.dynamicType.nonNullable());
+  });
+
+  var compiler2 = compilerFor(TEST2, uri);
+  compiler2.runCompiler(uri).then((_) {
+    var typesInferrer = compiler2.typesTask.typesInferrer;
+
+    checkReturn(compiler2, typesInferrer, 'test1',
+        typesInferrer.dynamicType.nonNullable());
+    checkReturn(compiler2, typesInferrer, 'test2', typesInferrer.mapType);
+    checkReturn(compiler2, typesInferrer, 'test3', typesInferrer.mapType);
+    checkReturn(compiler2, typesInferrer, 'test4', typesInferrer.mapType);
+    checkReturn(compiler2, typesInferrer, 'test5', typesInferrer.mapType);
+
+    checkReturn(compiler2, typesInferrer, 'test6', typesInferrer.numType);
+    checkReturn(compiler2, typesInferrer, 'test7', typesInferrer.intType);
+    checkReturn(compiler2, typesInferrer, 'test8', typesInferrer.intType);
+    checkReturn(compiler2, typesInferrer, 'test9', typesInferrer.intType);
+    checkReturn(compiler2, typesInferrer, 'test10', typesInferrer.numType);
+    checkReturn(compiler2, typesInferrer, 'test11', typesInferrer.doubleType);
+  });
 }