Add isolate tag-profile and better handling of errors

runtime/bin/vmservice/client/lib/src/elements/service_exception_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 stack_trace_element;
+library service_exception_view_element;
 
+import 'observatory_element.dart';
 import 'package:polymer/polymer.dart';
-import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 
-@CustomTag('stack-trace')
-class StackTraceElement extends ObservatoryElement {
-  @published ServiceMap trace;
+/// Displays a ServiceException
+@CustomTag('service-exception-view')
+class ServiceExceptionViewElement extends ObservatoryElement {
+  @published ServiceException exception;
 
-  StackTraceElement.created() : super.created();
-
-  void refresh(var done) {
-    trace.reload().whenComplete(done);
-  }
-}
+  ServiceExceptionViewElement.created() : super.created();
+}