Handle vmservice messages while at breakpoint.

runtime/bin/vmservice/client/lib/src/observatory_elements/breakpoint_list.dart

Index: runtime/bin/vmservice/client/lib/src/observatory_elements/breakpoint_list.dart
===================================================================
--- runtime/bin/vmservice/client/lib/src/observatory_elements/breakpoint_list.dart	(revision 0)
+++ runtime/bin/vmservice/client/lib/src/observatory_elements/breakpoint_list.dart	(working copy)
@@ -0,0 +1,15 @@
+// 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 breakpoint_list_element;
+
+import 'observatory_element.dart';
+import 'package:polymer/polymer.dart';
+
+@CustomTag('breakpoint-list')
+class BreakpointListElement extends ObservatoryElement {
+  @published Map msg = toObservable({});
+
+  BreakpointListElement.created() : super.created();
+}