Roll Observatory packages and add a roll script

charted/lib/charts/src/chart_events_impl.dart

Index: charted/lib/charts/src/chart_events_impl.dart
diff --git a/charted/lib/charts/src/chart_events_impl.dart b/charted/lib/charts/src/chart_events_impl.dart
deleted file mode 100644
index 6e2c258b714f0467972d6e34ea36859bac329fba..0000000000000000000000000000000000000000
--- a/charted/lib/charts/src/chart_events_impl.dart
+++ /dev/null
@@ -1,47 +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
-//
-
-part of charted.charts;
-
-class DefaultChartEventImpl implements ChartEvent {
-  @override
-  final ChartArea area;
-
-  @override
-  final ChartSeries series;
-
-  @override
-  final MouseEvent source;
-
-  @override
-  final int column;
-
-  @override
-  final int row;
-
-  @override
-  final num value;
-
-  @override
-  num chartX = 0;
-
-  @override
-  num chartY = 0;
-
-  DefaultChartEventImpl(this.source, this.area,
-      [this.series, this.row, this.column, this.value]) {
-    var hostRect = area.host.getBoundingClientRect(),
-        left = area.config.isRTL
-            ? area.theme.padding.end
-            : area.theme.padding.start;
-    if (source != null) {
-      chartX = source.client.x - hostRect.left - left;
-      chartY = source.client.y - hostRect.top - area.theme.padding.top;
-    }
-  }
-}