Put the analytics UI behind a flag.

pkg/telemetry/lib/telemetry.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:path/path.dart' as path;
 import 'package:usage/src/usage_impl.dart';
 import 'package:usage/src/usage_impl_io.dart';
 import 'package:usage/src/usage_impl_io.dart' as usage_io show getDartVersion;
 import 'package:usage/usage.dart';
 import 'package:usage/usage_io.dart';
 
 export 'package:usage/usage.dart' show Analytics;
 
 // TODO(devoncarew): Hard-coded to off for now. Remove when we're ready to ship.
 final bool _HARD_CODE_OFF = true;
 
+// TODO(devoncarew): Don't show the UI until we're ready to ship.
+final bool SHOW_ANALYTICS_UI = false;
+
 final String _dartDirectoryName = '.dart';
 final String _settingsFileName = 'analytics.json';
 
 /// Dart SDK tools with analytics should display this notice.
 ///
 /// In addition, they should support displaying the analytics' status, and have
 /// a flag to toggle analytics. This may look something like:
 ///
 /// `Analytics are currently enabled (and can be disabled with --no-analytics).`
 final String analyticsNotice =
@@ skipping 85 matching lines @@
   // - CHROME_HEADLESS and BUILDBOT_BUILDERNAME are properties on Chrome infra
   //   bots.
   return Platform.environment['TRAVIS'] == 'true' ||
       Platform.environment['BOT'] == 'true' ||
       Platform.environment['CONTINUOUS_INTEGRATION'] == 'true' ||
       Platform.environment['CHROME_HEADLESS'] == '1' ||
       Platform.environment.containsKey('BUILDBOT_BUILDERNAME') ||
       Platform.environment.containsKey('APPVEYOR') ||
       Platform.environment.containsKey('CI');
 }