Teach the Observatory about Contexts. Factor out object graph information from the instance view.

runtime/bin/vmservice/observatory/lib/src/elements/service_view.dart

 // Copyright (c) 2013, 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.
 
 library service_object_view_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/tracer.dart';
@@ skipping 20 matching lines @@
         element.msg = object;
         return element;
       case 'Class':
         ClassViewElement element = new Element.tag('class-view');
         element.cls = object;
         return element;
       case 'Code':
         CodeViewElement element = new Element.tag('code-view');
         element.code = object;
         return element;
+      case 'Context':
+        ContextViewElement element = new Element.tag('context-view');
+        element.context = object;
+        return element;
       case 'Error':
         ErrorViewElement element = new Element.tag('error-view');
         element.error = object;
         return element;
       case 'Field':
         FieldViewElement element = new Element.tag('field-view');
         element.field = object;
         return element;
       case 'FlagList':
         FlagListElement element = new Element.tag('flag-list');
@@ skipping 204 matching lines @@
 
   dynamic expander() {
     return expandEvent;
   }
 
   void expandEvent(bool exp, var done) {
     expand = exp;
     done();
   }
 }