Update charted to 0.4.8 and roll

packages/collection/test/equality_set_test.dart

+// Copyright (c) 2016, 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.
+
+import 'package:collection/collection.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test("uses the given equality", () {
+    var set = new EqualitySet(const IterableEquality());
+    expect(set, isEmpty);
+
+    var list1 = [1, 2, 3];
+    expect(set.add(list1), isTrue);
+    expect(set, contains([1, 2, 3]));
+    expect(set, contains(same(list1)));
+
+    var list2 = [1, 2, 3];
+    expect(set.add(list2), isFalse);
+    expect(set, contains([1, 2, 3]));
+    expect(set, contains(same(list1)));
+    expect(set, isNot(contains(same(list2))));
+
+    var list3 = [2, 3, 4];
+    expect(set.add(list3), isTrue);
+    expect(set, contains(same(list1)));
+    expect(set, contains(same(list3)));
+  });
+
+  test("EqualitySet.from() prefers the lattermost equivalent value", () {
+    var list1 = [1, 2, 3];
+    var list2 = [2, 3, 4];
+    var list3 = [1, 2, 3];
+    var list4 = [2, 3, 4];
+    var list5 = [1, 2, 3];
+    var list6 = [1, 2, 3];
+
+    var set = new EqualitySet.from(
+        const IterableEquality(), [list1, list2, list3, list4, list5, list6]);
+
+    expect(set, contains(same(list1)));
+    expect(set, contains(same(list2)));
+    expect(set, isNot(contains(same(list3))));
+    expect(set, isNot(contains(same(list4))));
+    expect(set, isNot(contains(same(list5))));
+    expect(set, isNot(contains(same(list6))));
+  });
+}