Add isolate tag-profile and better handling of errors

runtime/bin/vmservice/client/lib/src/elements/service_exception_view.dart

Index: runtime/bin/vmservice/client/lib/src/elements/service_exception_view.dart
diff --git a/runtime/bin/vmservice/client/lib/src/elements/stack_trace.dart b/runtime/bin/vmservice/client/lib/src/elements/service_exception_view.dart
similarity index 55%
copy from runtime/bin/vmservice/client/lib/src/elements/stack_trace.dart
copy to runtime/bin/vmservice/client/lib/src/elements/service_exception_view.dart
index f92630eb2b8b516123da7287fcaa834a4fc28b81..9a161e4830d1225a0f3efb3d5a0fa030a8dfe352 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/stack_trace.dart
+++ b/runtime/bin/vmservice/client/lib/src/elements/service_exception_view.dart
@@ -2,19 +2,16 @@
 // 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 'package:polymer/polymer.dart';
 import 'observatory_element.dart';
+import 'package:polymer/polymer.dart';
 import 'package:observatory/service.dart';
 
-@CustomTag('stack-trace')
-class StackTraceElement extends ObservatoryElement {
-  @published ServiceMap trace;
-
-  StackTraceElement.created() : super.created();
+/// Displays a ServiceException
+@CustomTag('service-exception-view')
+class ServiceExceptionViewElement extends ObservatoryElement {
+  @published ServiceException exception;
 
-  void refresh(var done) {
-    trace.reload().whenComplete(done);
-  }
-}
+  ServiceExceptionViewElement.created() : super.created();
+}