Roll Observatory packages and add a roll script

charted/lib/core/timer.dart

Index: charted/lib/core/timer.dart
diff --git a/charted/lib/core/timer.dart b/charted/lib/core/timer.dart
deleted file mode 100644
index a1666314b7c07137555cacb53a539b64a3f2d9a3..0000000000000000000000000000000000000000
--- a/charted/lib/core/timer.dart
+++ /dev/null
@@ -1,99 +0,0 @@
-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-/// A [window.requestAnimationFrame] based timer for use with transitions.
-/// Uses [dart.async.Timer] when the time until next timeout is too long.
-library charted.core.timer;
-
-import 'dart:async';
-import 'dart:html' show window;
-import 'dart:collection';
-
-typedef bool TimerCallback(int time);
-
-class AnimationTimer extends LinkedListEntry {
-  static LinkedList<AnimationTimer> _queue = new LinkedList<AnimationTimer>();
-
-  /// true if we are already waiting for window.animationFrame. At any given
-  /// time, only one of _timerScheduled and _animationFrameRequested are set
-  static bool _animationFrameRequested = false;
-
-  /// Instance of currently scheduled timer. At any given time, only one
-  /// of _timerScheduled and _animationFrameRequested are set.
-  static Timer _timerScheduled;
-
-  /// Currently active timer.
-  static AnimationTimer active;
-
-  /// Callback function that is called when the timer is fired.
-  final TimerCallback callback;
-
-  /// Start time of the animation.
-  final int time;
-
-  /// Schedule a new [callback] to be called [delay] micro-seconds after
-  /// [then] micro-seconds since epoch.
-  AnimationTimer(this.callback, { int delay: 0, int then: null })
-      : time = then == null
-          ? new DateTime.now().millisecondsSinceEpoch + delay
-          : then + delay {
-    _queue.add(this);
-    if (!_animationFrameRequested) {
-      if (_timerScheduled != null) {
-        _timerScheduled.cancel();
-      }
-      _animationFrameRequested = true;
-      window.animationFrame.then(_step);
-    }
-  }
-
-  /// Iterate through all timers, call the callbacks where necessary and
-  /// return milliseconds until next timer.
-  static int flush() {
-    int now = new DateTime.now().millisecondsSinceEpoch;
-    int earliest = null;
-    AnimationTimer timer = _queue.isEmpty ? null : _queue.first;
-
-    while(timer != null) {
-      bool finished = false;
-      AnimationTimer ref = timer;
-
-      if (now > timer.time) {
-        active = timer;
-        finished = timer.callback(now - timer.time);
-      }
-      if (!finished && (earliest == null || timer.time < earliest)) {
-        earliest = timer.time;
-      }
-      timer = timer.next;
-      if (finished) ref.unlink();
-    }
-    active = null;
-    return earliest == null ? earliest : earliest - now;
-  }
-
-  /// Internal timer and animation frame handler.
-  _step([_]) {
-    int delay = flush();
-
-    if (delay == null) {
-      _animationFrameRequested = false;
-    }
-    else if (delay > 24) {
-      if (_timerScheduled != null) {
-        _timerScheduled.cancel();
-      }
-      _timerScheduled = new Timer(new Duration(milliseconds: delay), _step);
-      _animationFrameRequested = false;
-    }
-    else {
-      _animationFrameRequested = true;
-      window.animationFrame.then(_step);
-    }
-  }
-}