Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/unittest/html_individual_config.dart

Index: observatory_pub_packages/unittest/html_individual_config.dart
===================================================================
--- observatory_pub_packages/unittest/html_individual_config.dart	(revision 0)
+++ observatory_pub_packages/unittest/html_individual_config.dart	(working copy)
@@ -0,0 +1,49 @@
+// 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.
+
+/// A unit test library for running groups of tests in a browser, instead of the
+/// entire test file. This is especially used for large tests files that have
+/// many subtests, so we can mark groups as failing at a finer granularity than
+/// the entire test file.
+///
+/// To use, import this file, and call [useHtmlIndividualConfiguration] at the
+/// start of your set sequence. Important constraint: your group descriptions
+/// MUST NOT contain spaces.
+library unittest.html_individual_config;
+
+import 'dart:html';
+import 'unittest.dart' as unittest;
+import 'html_config.dart' as htmlconfig;
+
+class HtmlIndividualConfiguration extends htmlconfig.HtmlConfiguration {
+  HtmlIndividualConfiguration(bool isLayoutTest): super(isLayoutTest);
+
+  void onStart() {
+    var search = window.location.search;
+    if (search != '') {
+      var groups = search.substring(1).split('&')
+          .where((p) => p.startsWith('group='))
+          .toList();
+
+      if (!groups.isEmpty) {
+        if (groups.length > 1) {
+          throw new ArgumentError('More than one "group" parameter provided.');
+        }
+
+        var testGroupName = groups.single.split('=')[1];
+        var startsWith = "$testGroupName${unittest.groupSep}";
+        unittest.filterTests((unittest.TestCase tc) =>
+            tc.description.startsWith(startsWith));
+      }
+    }
+    super.onStart();
+  }
+}
+
+void useHtmlIndividualConfiguration([bool isLayoutTest = false]) {
+  unittest.unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
+}
+
+final _singletonLayout = new HtmlIndividualConfiguration(true);
+final _singletonNotLayout = new HtmlIndividualConfiguration(false);