Roll Observatory packages and add a roll script

charted/lib/charts/src/chart_series_impl.dart

-//
-// 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
-//
-
-part of charted.charts;
-
-class DefaultChartSeriesImpl extends ChangeNotifier implements ChartSeries {
-  final String name;
-
-  Iterable<String> _measureAxisIds;
-  Iterable<int> _measures;
-  ChartRenderer _renderer;
-
-  SubscriptionsDisposer _disposer = new SubscriptionsDisposer();
-
-  DefaultChartSeriesImpl(this.name, Iterable<int> measures, this._renderer,
-      Iterable<String> measureAxisIds) {
-    this.measures = measures;
-    this.measureAxisIds = measureAxisIds;
-  }
-
-  set renderer(ChartRenderer value) {
-    if (value != null && value == _renderer) return;
-    _renderer.dispose();
-    _renderer = value;
-    notifyChange(new ChartSeriesChangeRecord(this));
-  }
-
-  ChartRenderer get renderer => _renderer;
-
-  set measures(Iterable<int> value) {
-    _measures = value;
-
-    if (_measures is ObservableList) {
-      _disposer.add(
-          (_measures as ObservableList).listChanges.listen(_measuresChanged));
-    }
-  }
-
-  Iterable<int> get measures => _measures;
-
-  set measureAxisIds(Iterable<String> value) => _measureAxisIds = value;
-  Iterable<String> get measureAxisIds => _measureAxisIds;
-
-  _measuresChanged(_) {
-    if (_measures is! ObservableList) return;
-    notifyChange(new ChartSeriesChangeRecord(this));
-  }
-}