Dart: Adds a content handler and a test.

services/dart/lib/application.dart

Index: services/dart/lib/application.dart
diff --git a/services/dart/lib/application.dart b/services/dart/lib/application.dart
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index 0000000000000000000000000000000000000000..75243ddaed51c2845fd74454eb292b3949d2d4a7
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+++ b/services/dart/lib/application.dart
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+// 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.
+
+library application;
+
+import 'dart:async';
+import 'dart:convert';
+import 'dart:mojo_bindings' as bindings;
+import 'dart:mojo_core' as core;
+import 'dart:typed_data';
+
+import 'package:mojo/public/interfaces/application/application.mojom.dart' as application;
+import 'package:mojo/public/interfaces/application/service_provider.mojom.dart' as service_provider;
+import 'package:mojo/public/interfaces/application/shell.mojom.dart' as shell;
+
+part 'src/application.dart';
+part 'src/service_provider.dart';