Roll Observatory packages and add a roll script

charted/lib/core/text_metrics/segmentation_utils.dart

Index: charted/lib/core/text_metrics/segmentation_utils.dart
diff --git a/charted/lib/core/text_metrics/segmentation_utils.dart b/charted/lib/core/text_metrics/segmentation_utils.dart
deleted file mode 100644
index d3e724c21a359b08145904aa33d6f6877dd42c56..0000000000000000000000000000000000000000
--- a/charted/lib/core/text_metrics/segmentation_utils.dart
+++ /dev/null
@@ -1,26 +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
-//
-
-library charted.core.text_metrics.segmentation_utils;
-
-const CODE_CATEGORY_OTHER = 0;
-
-const CodeUnitCategory = const{
-  'Other': CODE_CATEGORY_OTHER,
-  'CR': 1,
-  'LF': 2,
-  'Control': 3,
-  'Extend': 4,
-  'SpacingMark': 5,
-  'L': 6,
-  'V': 7,
-  'T': 8,
-  'LV': 9,
-  'LVT': 10,
-  'Regional_Indicator': 11
-};