Roll Observatory packages and add a roll script

charted/lib/charts/chart_renderer.dart

Index: charted/lib/charts/chart_renderer.dart
diff --git a/charted/lib/charts/chart_renderer.dart b/charted/lib/charts/chart_renderer.dart
deleted file mode 100644
index 0a2405e48aaf2f00e8102ec2d0404aa2a6ee11ad..0000000000000000000000000000000000000000
--- a/charted/lib/charts/chart_renderer.dart
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-//
-// 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;
-
-///
-/// Renders the chart on a CartesianArea.
-///
-abstract class CartesianRenderer extends ChartRenderer {
-  /// Returns extent of the series. This extent is used by [ChartArea] to
-  /// set the output range of the corresponding scale/axis of the series.
-  ///
-  /// Extent has valid values only if [prepare] was already called.
-  Extent get extent;
-
-  /// Returns extent of a given row.
-  Extent extentForRow(Iterable row);
-
-  /// Indicates if this renderer uses range "band" on any of the dimension
-  /// axis. Band is space taken on the dimension axis (if more than a point).
-  ///
-  /// Examples:
-  ///   A bar chart takes up space (width of the bar) on the dimension axis.
-  ///   A line chart does not take any space
-  Iterable<int> get dimensionsUsingBand;
-
-  /// Hint for padding between two bands that [ChartArea] will use for layout.
-  /// This getter is called only for renderers that have [dimensionsUsingBand]
-  /// set to non-empty list.
-  double get bandInnerPadding;
-
-  /// Hint for padding before first and after the last bands
-  /// This getter is called only for renderers that have [dimensionsUsingBand]
-  /// set to non-empty list.
-  double get bandOuterPadding;
-
-  /// Render series data on the passed [host].
-  /// Draw will not be successful if [prepare] was not already called.
-  void draw(Element host, {Future schedulePostRender});
-}
-
-///
-/// Renders layout visualization on a LayoutArea
-///
-abstract class LayoutRenderer extends ChartRenderer {
-  /// Create a layout/visualization from the data. Layout will not be successful
-  /// if [prepare] was not already called.
-  Iterable<ChartLegendItem> layout(Element host, {Future schedulePostRender});
-}
-
-///
-/// Common interface for all renderers in Charted
-///
-abstract class ChartRenderer extends ChartRendererBehaviorSource {
-  /// Name of the renderer.
-  /// The name can only include chars that are allowed in the CSS for selectors.
-  String get name;
-
-  /// Prepare the chart for rendering.
-  /// - [area] represents the [ChartArea] on which the chart is rendered.
-  /// - [series] represents the [ChartSeries] that is rendered
-  bool prepare(ChartArea area, ChartSeries series);
-
-  /// Clears DOM created by this renderer and releases
-  /// references to passed objects.
-  void dispose();
-}