Update charted to 0.4.8 and roll

packages/observe/benchmark/observable_list_benchmark.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-library observe.test.benchmark.observable_list_benchmark;
-
-import 'package:observe/observe.dart';
-import 'observation_benchmark_base.dart';
-
-class ObservableListBenchmark extends ObservationBenchmarkBase {
-  final int elementCount = 100;
-
-  ObservableListBenchmark(int objectCount, int mutationCount, String config)
-      : super('ObservableListBenchmark:$objectCount:$mutationCount:$config',
-          objectCount, mutationCount, config);
-
-  @override
-  int mutateObject(ObservableList obj) {
-    switch (config) {
-      case 'update':
-        var size = (elementCount / 10).floor();
-        for (var j = 0; j < size; j++) {
-          obj[j * size]++;
-        }
-        return size;
-
-      case 'splice':
-        var size = (elementCount / 5).floor();
-        // No splice equivalent in List, so we hardcode it.
-        var removed = obj.sublist(size, size * 2);
-        obj.removeRange(size, size * 2);
-        obj.insertAll(size * 2, removed);
-        return size * 2;
-
-      case 'push/pop':
-        var val = obj.removeLast();
-        obj.add(val + 1);
-        return 2;
-
-      case 'shift/unshift':
-        var val = obj.removeAt(0);
-        obj.insert(0, val + 1);
-        return 2;
-
-      default:
-        throw new ArgumentError(
-            'Invalid config for ObservableListBenchmark: $config');
-    }
-  }
-
-  @override
-  ObservableList newObject() {
-    var list = new ObservableList();
-    for (int i = 0; i < elementCount; i++) {
-      list.add(i);
-    }
-    return list;
-  }
-}