Dart: Reorganize files

mojo/dart/test/handle_finalizer_test.dart

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'dart:async';
-import 'dart:isolate';
-import 'dart:typed_data';
-
-import 'package:_mojo_for_test_only/expect.dart';
-import 'package:mojo/core.dart';
-
-MojoHandle leakMojoHandle() {
-  var pipe = new MojoMessagePipe();
-  Expect.isNotNull(pipe);
-
-  var endpoint = pipe.endpoints[0];
-  Expect.isTrue(endpoint.handle.isValid);
-
-  var eventSubscription = new MojoEventSubscription(endpoint.handle);
-  // After making a MojoEventSubscription, the underlying mojo handle will have
-  // the native MojoClose called on it when the MojoEventSubscription is GC'd or
-  // the VM shuts down.
-
-  return endpoint.handle;
-}
-
-// vmoptions: --new-gen-semi-max-size=1 --old_gen_growth_rate=1
-List<int> triggerGC() {
-  var l = new List.filled(1000000, 7);
-  return l;
-}
-
-test() {
-  MojoHandle handle = leakMojoHandle();
-  triggerGC();
-
-  // The handle will be closed by the MojoHandle finalizer during GC, so the
-  // attempt to close it again will fail.
-  int result = handle.close();
-  Expect.isTrue(result == MojoResult.kInvalidArgument);
-}
-
-main() {
-  test();
-}