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

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

Index: runtime/bin/vmservice/observatory/lib/src/elements/object_common.dart
diff --git a/runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart b/runtime/bin/vmservice/observatory/lib/src/elements/object_common.dart
similarity index 61%
copy from runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart
copy to runtime/bin/vmservice/observatory/lib/src/elements/object_common.dart
index ae7fca9f3e0e34182187e388f31322b97c70022c..b1814e4acca48805e6681d9db0d53bdb864ef009 100644
--- a/runtime/bin/vmservice/observatory/lib/src/elements/instance_view.dart
+++ b/runtime/bin/vmservice/observatory/lib/src/elements/object_common.dart
@@ -2,50 +2,45 @@
 // 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 instance_view_element;
+library object_common_element;
 
 import 'dart:async';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
 
-@CustomTag('instance-view')
-class InstanceViewElement extends ObservatoryElement {
-  @published Instance instance;
+@CustomTag('object-common')
+class ObjectCommonElement extends ObservatoryElement {
+  @published ServiceObject object;
   @published ServiceMap path;
   @published ServiceMap inboundReferences;
   @observable int retainedBytes = null;
 
-  InstanceViewElement.created() : super.created();
-
-  Future<ServiceObject> eval(String text) {
-    return instance.isolate.get(
-        instance.id + "/eval?expr=${Uri.encodeComponent(text)}");
-  }
+  ObjectCommonElement.created() : super.created();
 
   // TODO(koda): Add no-arg "calculate-link" instead of reusing "eval-link".
   Future<ServiceObject> retainedSize(var dummy) {
-    return instance.isolate.get(instance.id + "/retained")
+    return object.isolate.get(object.id + "/retained")
         .then((ServiceMap obj) {
           retainedBytes = int.parse(obj['valueAsString']);
         });
   }
 
   Future<ServiceObject> retainingPath(var arg) {
-    return instance.isolate.get(instance.id + "/retaining_path?limit=$arg")
+    return object.isolate.get(object.id + "/retaining_path?limit=$arg")
         .then((ServiceObject obj) {
           path = obj;
         });
   }
 
   Future<ServiceObject> fetchInboundReferences(var arg) {
-    return instance.isolate.get(instance.id + "/inbound_references?limit=$arg")
+    return object.isolate.get(object.id + "/inbound_references?limit=$arg")
         .then((ServiceObject obj) {
            inboundReferences = obj;
         });
   }
 
-  void refresh(var done) {
-    instance.reload().whenComplete(done);
+  void refresh(Function onDone) {
+    object.reload().whenComplete(onDone);
   }
 }