Roll Observatory packages and add a roll script

packages/usage/test/usage_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.
+
+library usage.usage_test;
+
+import 'package:unittest/unittest.dart';
+import 'package:usage/usage.dart';
+
+void defineTests() {
+  group('AnalyticsMock', () {
+    test('simple', () {
+      AnalyticsMock mock = new AnalyticsMock();
+      mock.sendScreenView('main');
+      mock.sendEvent('files', 'save');
+      mock.sendSocial('g+', 'plus', 'userid');
+      mock.sendTiming('compile', 123);
+      mock.startTimer('compile').finish();
+      mock.sendException('FooException');
+      mock.setSessionValue('val', 'ue');
+      return mock.waitForLastPing();
+    });
+  });
+
+  group('sanitizeStacktrace', () {
+    test('replace file', () {
+      expect(sanitizeStacktrace(
+          '(file:///Users/foo/tmp/error.dart:3:13)',
+          shorten: false),
+          '(error.dart:3:13)');
+    });
+
+    test('replace files', () {
+      expect(sanitizeStacktrace(
+          'foo (file:///Users/foo/tmp/error.dart:3:13)\n'
+          'bar (file:///Users/foo/tmp/error.dart:3:13)',
+          shorten: false),
+          'foo (error.dart:3:13)\nbar (error.dart:3:13)');
+    });
+
+    test('shorten 1', () {
+      expect(sanitizeStacktrace(
+          '(file:///Users/foo/tmp/error.dart:3:13)'),
+          '(error.dart:3:13)');
+    });
+
+    test('shorten 2', () {
+      expect(sanitizeStacktrace(
+          'foo (file:///Users/foo/tmp/error.dart:3:13)\n'
+          'bar (file:///Users/foo/tmp/error.dart:3:13)'),
+          'foo (error.dart:3:13) bar (error.dart:3:13)');
+    });
+
+    test('shorten 3', () {
+      expect(sanitizeStacktrace(
+          'foo (package:foo/foo.dart:3:13)\n'
+          'bar (dart:async/schedule_microtask.dart:41)'),
+          'foo (foo/foo.dart:3:13) bar (async/schedule_microtask.dart:41)');
+    });
+  });
+}