Build Observatory as part of runtime

runtime/bin/vmservice/observatory/test/metrics_test.dart

-// Copyright (c) 2014, 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.
-
-import 'package:observatory/service_io.dart';
-import 'package:unittest/unittest.dart';
-import 'test_helper.dart';
-
-import 'dart:profiler';
-
-void script() {
-  var counter = new Counter('a.b.c', 'description');
-  Metrics.register(counter);
-  counter.value = 1234.5;
-}
-
-var tests = [
-
-(Isolate isolate) =>
-  isolate.get('metrics').then((ServiceMap metrics) {
-    expect(metrics['type'], equals('MetricList'));
-    var members = metrics['members'];
-    expect(members, isList);
-    expect(members.length, equals(1));
-    var counter = members[0];
-    expect(counter.name, equals('a.b.c'));
-    expect(counter.value, equals(1234.5));
-}),
-
-(Isolate isolate) =>
-  isolate.get('metrics/a.b.c').then((ServiceMetric counter) {
-    expect(counter.name, equals('a.b.c'));
-    expect(counter.value, equals(1234.5));
-}),
-
-(Isolate isolate) =>
-  isolate.get('metrics/a.b.d').then((DartError err) {
-    expect(err is DartError, isTrue);
-}),
-
-];
-
-main(args) => runIsolateTests(args, tests, testeeBefore: script);