Dart2js option to dump info about compilation

tests/compiler/dart2js/dump_info_test.dart

Index: tests/compiler/dart2js/dump_info_test.dart
diff --git a/tests/compiler/dart2js/dump_info_test.dart b/tests/compiler/dart2js/dump_info_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ef41790467d3fb76e42d7b3d1b8f3906606b8f04
--- /dev/null
+++ b/tests/compiler/dart2js/dump_info_test.dart
@@ -0,0 +1,50 @@
+// Copyright (c) 2012, 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.
+// Test that parameters keep their names in the output.
+
+import 'dart:async';
+import "package:expect/expect.dart";
+import "package:async_helper/async_helper.dart";
+import 'memory_compiler.dart';
+
+const String TEST_ONE = r"""
+library main;
+
+int a = 2;
+
+class c {
+  final int m;
+  c(this.m);
+}
+
+void f() {
+  () {} (); // TODO (sigurdm) empty closure, hack to avoid inlining

[Johnni Winther, 2013/12/10 10:40:53]

Nit: Fully format comments: 
TODO(sigurdm): Empty closure, hack to avoid inlining.

[sigurdm, 2013/12/10 11:50:39]

Done.

+  a = 2;
+}
+
+main() {
+  f();
+  new c(2);
+}
+""";
+
+main() {
+  var compiler = compilerFor({'main.dart': TEST_ONE});
+  asyncTest(() => compiler.runCompiler(Uri.parse('memory:main.dart')).then((_) {
+    var info = compiler.dumpInfoTask.collectDumpInfo();
+    var mainlib = info.libraries[0];
+    Expect.stringEquals("main", mainlib.name);
+    var contents = mainlib.contents;
+    Expect.stringEquals("main", mainlib.name);
+    Expect.stringEquals("a", contents[0].name);
+    Expect.stringEquals("c", contents[1].name);
+    Expect.stringEquals("f", contents[2].name);
+    Expect.stringEquals("main", contents[3].name);
+    Expect.stringEquals("library", mainlib.kind);
+    Expect.stringEquals("field", contents[0].kind);
+    Expect.stringEquals("class", contents[1].kind);
+    Expect.stringEquals("function", contents[2].kind);
+    Expect.stringEquals("function", contents[3].kind);
+  }));
+}