Add toUri and fromUri functions to pathos.

sdk/lib/_internal/dartdoc/bin/dartdoc.dart

 // Copyright (c) 2012, 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.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 196 matching lines @@
 
   final entrypoints = <Uri>[];
   try {
     final option = argParser.parse(args);
 
     // This checks to see if the root of all entrypoints is the same.
     // If it is not, then we display a warning, as package imports might fail.
     var entrypointRoot;
     for (final entrypoint in option.rest) {
       var uri = Uri.parse(entrypoint);
-      if (uri.scheme == '') uri = pathToFileUri(entrypoint);
+      if (uri.scheme == '') uri = path.toUri(entrypoint);
       entrypoints.add(uri);
 
       if (uri.scheme != 'file') continue;
       if (entrypointRoot == null) {
         entrypointRoot = path.dirname(entrypoint);
       } else if (entrypointRoot != path.dirname(entrypoint)) {
         print('Warning: entrypoints are at different directories. "package:"'
             ' imports may fail.');
       }
     }
@@ skipping 39 matching lines @@
     .whenComplete(() => dartdoc.cleanup());
 }
 
 String _getPackageRoot(List<Uri> entrypoints) {
   // Check if there's a `packages` directory in the entry point directory.
   var fileEntrypoint = entrypoints.firstWhere(
       (entrypoint) => entrypoint.scheme == 'file',
       orElse: () => null);
   if (fileEntrypoint == null) return;
 
-  var script = path.normalize(path.absolute(fileUriToPath(fileEntrypoint)));
+  var script = path.normalize(path.absolute(path.fromUri(fileEntrypoint)));
   var dir = path.join(path.dirname(script), 'packages/');
   if (new Directory(dir).existsSync()) return dir;
 
   // If there is not, then check if the entrypoint is somewhere in a `lib`
   // directory.
   var parts = path.split(path.dirname(script));
   var libDir = parts.lastIndexOf('lib');
   if (libDir > 0) {
     return path.join(path.joinAll(parts.take(libDir)), 'packages');
   } else {
     return null;
   }
 }