Roll Observatory packages and add a roll script

charted/lib/charts/data_transformers/filter_transformer.dart

Index: charted/lib/charts/data_transformers/filter_transformer.dart
diff --git a/charted/lib/charts/data_transformers/filter_transformer.dart b/charted/lib/charts/data_transformers/filter_transformer.dart
deleted file mode 100644
index 393c453f6fbb85dba29b18ae610b29ad110c5c7a..0000000000000000000000000000000000000000
--- a/charted/lib/charts/data_transformers/filter_transformer.dart
+++ /dev/null
@@ -1,81 +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;
-
-typedef bool FilterFunction(dynamic value);
-
-/**
- * Transforms the ChartData base on the specified FilterDefinitions.  Each row
- * of data will be tested by passing the value at target column to the filter
- * function.  If filter function returns false, the row will be filtered out.
- * This transformer does not modify the column part of the input ChartData.
- */
-class FilterTransformer extends ChangeNotifier
-    implements ChartDataTransform, ChartData {
-  final SubscriptionsDisposer _dataSubscriptions = new SubscriptionsDisposer();
-  Iterable<ChartColumnSpec> columns;
-  ObservableList<Iterable> rows = new ObservableList();
-  List<FilterDefinition> filterFunctions;
-  ChartData _data;
-
-  FilterTransformer(this.filterFunctions);
-
-  /**
-   * Transforms the input data with the list of [FilterDefinition] specified in
-   * the constructor.  If the rows and columns are ObservableList in the data,
-   * changes in rows and columns in input data will trigger transform to be
-   * performed again to update the output rows and columns.
-   */
-  ChartData transform(ChartData data) {
-    _data = data;
-    _registerListeners();
-    _transform();
-    return this;
-  }
-
-  /** Registers listeners if data.rows or data.columns are Observable. */
-  _registerListeners() {
-    _dataSubscriptions.dispose();
-
-    if(_data is Observable) {
-      var observable = (_data as Observable);
-      _dataSubscriptions.add(observable.changes.listen((records) {
-        _transform();
-
-        // NOTE: Currently we're only passing the first change because the chart
-        // area just draw with the updated data.  When we add partial update
-        // to chart area, we'll need to handle this better.
-        notifyChange(records.first);
-      }));
-    }
-  }
-
-  /**
-   * Performs the filter transform with _data.  This is called on transform and
-   * onChange if the input ChartData is Observable.
-   */
-  _transform() {
-    columns = _data.columns;
-    rows.clear();
-
-    for (var row in _data.rows) {
-      // Add the row if each value in target column passes the filter function.
-      if (filterFunctions.every((e) =>
-          e.filterFunc(row.elementAt(e.targetColumn)))) {
-        rows.add(row);
-      }
-    }
-  }
-}
-
-class FilterDefinition {
-  final FilterFunction filterFunc;
-  final int targetColumn;
-  FilterDefinition(this.targetColumn, this.filterFunc);
-}