UI for setting/clearing closure-specific breakpoints.

runtime/observatory/lib/src/elements/instance_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 instance_view_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;
 
   InstanceViewElement.created() : super.created();
 
   Future<ServiceObject> evaluate(String expression) {
     return instance.evaluate(expression);
   }
 
+  Future setBreakOnActivation() {
+    return instance.isolate.addBreakOnActivation(instance)
+        .then((_) => refresh());
+  }
+
+  Future clearBreakOnActivation() {
+    return instance.isolate.removeBreakpoint(instance.activationBreakpoint)
+        .then((_) => refresh());
+  }
+
   Future refresh() {
     return instance.reload();
   }
 }