Add Observatory to sky dart_controller

sky/engine/core/script/dart_service_isolate/main.dart

Index: sky/engine/core/script/dart_service_isolate/main.dart
diff --git a/mojo/dart/embedder/vmservice/main.dart b/sky/engine/core/script/dart_service_isolate/main.dart
similarity index 94%
copy from mojo/dart/embedder/vmservice/main.dart
copy to sky/engine/core/script/dart_service_isolate/main.dart
index 7e442ab4edb7773ee70313a9394e3becb5459118..1eb027d3de710764308111379504c7ad1fa1dd2b 100644
--- a/mojo/dart/embedder/vmservice/main.dart
+++ b/sky/engine/core/script/dart_service_isolate/main.dart
@@ -2,11 +2,11 @@
 // 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.
 
-library dart_controller_service_isolate;
+library sky_shell_dart_controller_service_isolate;
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:mojo.io';
+import 'dart:io';
 import 'dart:isolate';
 import 'dart:vmservice';