Add initial version of analytics and crash reporting package.

pkg/telemetry/test/crash_reporting_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:convert' show UTF8;
+
+import 'package:http/http.dart';
+import 'package:http/testing.dart';
+import 'package:telemetry/crash_reporting.dart';
+import 'package:test/test.dart';
+import 'package:usage/usage.dart';
+
+void main() {
+  group('crash_reporting', () {
+    MockClient mockClient;
+
+    Request request;
+
+    setUp(() {
+      mockClient = new MockClient((Request r) async {
+        request = r;
+        return new Response('crash-report-001', 200);
+      });
+    });
+
+    test('CrashReportSender', () async {
+      AnalyticsMock analytics = new AnalyticsMock();
+      CrashReportSender sender =
+          new CrashReportSender(analytics, httpClient: mockClient);
+
+      await sender.sendReport('test-error', stackTrace: StackTrace.current);
+
+      String body = UTF8.decode(request.bodyBytes);
+      expect(body, contains('String')); // error.runtimeType
+      expect(body, contains(analytics.trackingId));
+      expect(body, contains('1.0.0'));
+      expect(body, contains(analytics.clientId));
+    });
+  });
+}