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..27e7337052103871d18395857298bd0d316e6138
--- /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

[kasperl, 2013/11/29 12:03:13]

See if you can use @NoInline() annotation and get rid of the TODO.

[sigurdm, 2013/12/02 14:09:50]

This seems to be a bit harder - the annotation is only available internally to
the compiler.

+  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(mainlib.name, "main");

[kasperl, 2013/11/29 12:03:13]

Expect.stringEquals expects the expected result as the first parameter, so you
should swap the two arguments for all these calls.

[sigurdm, 2013/12/02 14:09:50]

Done.

+    var contents = mainlib.contents;
+    Expect.stringEquals(mainlib.name, "main");
+    Expect.stringEquals(contents[0].name, "a");
+    Expect.stringEquals(contents[1].name, "c");
+    Expect.stringEquals(contents[2].name, "f");
+    Expect.stringEquals(contents[3].name, "main");
+    Expect.stringEquals(mainlib.kind, "library");
+    Expect.stringEquals(contents[0].kind, "field");
+    Expect.stringEquals(contents[1].kind, "class");
+    Expect.stringEquals(contents[2].kind, "function");
+    Expect.stringEquals(contents[3].kind, "function");
+  }));
+}