Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/lib/src/progress.dart

Index: sdk/lib/_internal/pub_generated/lib/src/progress.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/progress.dart b/sdk/lib/_internal/pub_generated/lib/src/progress.dart
deleted file mode 100644
index 483157d2f6a6e552633edd56ec45e5ef8bc573d9..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/progress.dart
+++ /dev/null
@@ -1,100 +0,0 @@
-// Copyright (c) 2012, 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 pub.progress;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'log.dart' as log;
-import 'utils.dart';
-
-/// A live-updating progress indicator for long-running log entries.
-class Progress {
-  /// The timer used to write "..." during a progress log.
-  Timer _timer;
-
-  /// The [Stopwatch] used to track how long a progress log has been running.
-  final _stopwatch = new Stopwatch();
-
-  /// The progress message as it's being incrementally appended.
-  ///
-  /// When the progress is done, a single entry will be added to the log for it.
-  final String _message;
-
-  /// Gets the current progress time as a parenthesized, formatted string.
-  String get _time => "(${niceDuration(_stopwatch.elapsed)})";
-
-  /// Creates a new progress indicator.
-  ///
-  /// If [fine] is passed, this will log progress messages on [log.Level.FINE]
-  /// as opposed to [log.Level.MESSAGE].
-  Progress(this._message, {bool fine: false}) {
-    _stopwatch.start();
-
-    var level = fine ? log.Level.FINE : log.Level.MESSAGE;
-
-    // The animation is only shown when it would be meaningful to a human.
-    // That means we're writing a visible message to a TTY at normal log levels
-    // with non-JSON output.
-    if (stdioType(stdout) != StdioType.TERMINAL ||
-        !log.verbosity.isLevelVisible(level) ||
-        log.json.enabled ||
-        fine ||
-        log.verbosity.isLevelVisible(log.Level.FINE)) {
-      // Not animating, so just log the start and wait until the task is
-      // completed.
-      log.write(level, "$_message...");
-      return;
-    }
-
-    _timer = new Timer.periodic(new Duration(milliseconds: 100), (_) {
-      _update();
-    });
-
-    _update();
-  }
-
-  /// Stops the progress indicator.
-  void stop() {
-    _stopwatch.stop();
-
-    // Always log the final time as [log.fine] because for the most part normal
-    // users don't care about the precise time information beyond what's shown
-    // in the animation.
-    log.fine("$_message finished $_time.");
-
-    // If we were animating, print one final update to show the user the final
-    // time.
-    if (_timer == null) return;
-    _timer.cancel();
-    _timer = null;
-    _update();
-    stdout.writeln();
-  }
-
-  /// Stop animating the progress indicator.
-  ///
-  /// This will continue running the stopwatch so that the full time can be
-  /// logged in [stop].
-  void stopAnimating() {
-    if (_timer == null) return;
-
-    // Print a final message without a time indicator so that we don't leave a
-    // misleading half-complete time indicator on the console.
-    stdout.writeln(log.format("\r$_message..."));
-    _timer.cancel();
-    _timer = null;
-  }
-
-  /// Refreshes the progress line.
-  void _update() {
-    if (log.isMuted) return;
-
-    stdout.write(log.format("\r$_message... "));
-
-    // Show the time only once it gets noticeably long.
-    if (_stopwatch.elapsed.inSeconds > 0) stdout.write("${log.gray(_time)} ");
-  }
-}