Improve the performance of isWithin().

benchmark/benchmark.dart

 // Copyright (c) 2014, 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 '../lib/path.dart' as path;
 
 void runBenchmark(String name, Function func, List files) {
   // Warmup.
   for (int i = 0; i < 10000; i++) {
     for (var p in files) {
@@ skipping 28 matching lines @@
     benchmark('dirname', context.dirname);
     benchmark('extension', context.extension);
     benchmark('rootPrefix', context.rootPrefix);
     benchmark('isAbsolute', context.isAbsolute);
     benchmark('isRelative', context.isRelative);
     benchmark('isRootRelative', context.isRootRelative);
     benchmark('normalize', context.normalize);
     benchmark('relative', context.relative);
     benchmark('toUri', context.toUri);
     benchmark('prettyUri', context.prettyUri);
+    benchmark('isWithin', context.isWithin);
   }
 }
 
 const COMMON_PATHS = const ['.', '..', 'out/ReleaseIA32/packages'];
 
 final STYLE_PATHS = {
   path.Style.posix: [
     '/home/user/dart/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart',
   ],
   path.Style.url: [
     'https://example.server.org/443643002/path?top=yes#fragment',
   ],
   path.Style.windows: [
     r'C:\User\me\',
     r'\\server\share\my\folders\some\file.data',
   ],
 };