Add initial version of analytics and crash reporting package.

pkg/telemetry/test/telemetry_test.dart

+// Copyright (c) 2017, 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 'dart:io';
+
+import 'package:telemetry/telemetry.dart';
+import 'package:test/test.dart';
+import 'package:usage/usage.dart';
+
+void main() {
+  group('telemetry', () {
+    test('getDartStorageDirectory', () {
+      Directory dir = getDartStorageDirectory();
+      expect(dir, isNotNull);
+    });
+
+    test('getDartVersion', () {
+      expect(getDartVersion(), isNotNull);
+    });
+
+    test('createAnalyticsInstance', () {
+      Analytics analytics = createAnalyticsInstance('UA-0', 'test-app');
+      expect(analytics, isNotNull);
+      expect(analytics.trackingId, 'UA-0');
+      expect(analytics.getSessionValue('an'), 'test-app');
+      expect(analytics.getSessionValue('av'), isNotNull);
+      expect(analytics.clientId, isNotNull);
+    });
+  });
+}