Support default constructors in analyzer2dart.

tests/compiler/dart2js/backend_dart/end2end_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// End-to-end test of the dart2dart compiler.
 library dart_backend.end2end_test;
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/dart2jslib.dart';
 import 'package:compiler/src/dart_backend/dart_backend.dart';
 import 'package:expect/expect.dart';
 
 import '../../../../pkg/analyzer2dart/test/test_helper.dart' hide TestSpec;
 import '../../../../pkg/analyzer2dart/test/end2end_data.dart';
 
 import 'test_helper.dart';
 import '../output_collector.dart';
 
-main() {
-  performTests(TEST_DATA, asyncTester, (TestSpec result) {
-    OutputCollector outputCollector = new OutputCollector();
-    asyncTest(() => compilerFor(result.input, outputProvider: outputCollector)
-        .then((Compiler compiler) {
-      String expectedOutput = result.output.trim();
-      compiler.phase = Compiler.PHASE_COMPILING;
-      DartBackend backend = compiler.backend;
-      backend.assembleProgram();
-      String output = outputCollector.getOutput('', 'dart').trim();
-      Expect.equals(expectedOutput, output,
-          '\nInput:\n${result.input}\n'
-          'Expected:\n$expectedOutput\n'
-          'Actual:\n$output\n');
-    }));
-  });
+main(List<String> args) {
+  performTests(TEST_DATA, asyncTester, runTest, args);
+}
+
+runTest(TestSpec result) {
+  OutputCollector outputCollector = new OutputCollector();
+  asyncTest(() => compilerFor(result.input, outputProvider: outputCollector)
+      .then((Compiler compiler) {
+    String expectedOutput = result.output.trim();
+    compiler.phase = Compiler.PHASE_COMPILING;
+    DartBackend backend = compiler.backend;
+    backend.assembleProgram();
+    String output = outputCollector.getOutput('', 'dart').trim();
+    Expect.equals(expectedOutput, output,
+        '\nInput:\n${result.input}\n'
+        'Expected:\n$expectedOutput\n'
+        'Actual:\n$output\n');
+  }));
 }