Add Observatory to sky dart_controller

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

 // Copyright 2015 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.
 
 part of dart_controller_service_isolate;
 
 String detectMimeType(String name) {
   var extensionStart = name.lastIndexOf('.');
   var extension = name.substring(extensionStart+1);
   switch (extension) {
@@ skipping 30 matching lines @@
 }
 
 
 _addResource(String name, List<int> data) {
   var mimeType = detectMimeType(name);
   Resource resource = new Resource(name, mimeType, data);
   Resource.resources[name] = resource;
 }
 
 _triggerResourceLoad() native "ServiceIsolate_TriggerResourceLoad";