Change dart:io Platform.script to return a Uri.

sdk/lib/_internal/dartdoc/lib/dartdoc.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.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 52 matching lines @@
 const API_LOCATION = 'http://api.dartlang.org/';
 
 /**
  * Gets the full path to the directory containing the entrypoint of the current
  * script. In other words, if you invoked dartdoc, directly, it will be the
  * path to the directory containing `dartdoc.dart`. If you're running a script
  * that imports dartdoc, it will be the path to that script.
  */
 // TODO(johnniwinther): Convert to final (lazily initialized) variables when
 // the feature is supported.
-String get scriptDir => path.dirname(Platform.script);
+String get scriptDir => path.dirname(Platform.script.toFilePath());
 
 /**
  * Deletes and recreates the output directory at [path] if it exists.
  */
 void cleanOutputDirectory(String path) {
   final outputDir = new Directory(path);
   if (outputDir.existsSync()) {
     outputDir.deleteSync(recursive: true);
   }
   outputDir.createSync();
@@ skipping 685 matching lines @@
    * to generate navigation for them.
    */
   void docNavigationJson() {
     startFile('nav.json');
     writeln(JSON.encode(createNavigationInfo()));
     endFile();
   }
   /// Whether dartdoc is running from within the Dart SDK or the
   /// Dart source repository.
   bool get runningFromSdk =>
-    path.extension(Platform.script) == '.snapshot';
+      path.extension(Platform.script.toFilePath()) == '.snapshot';
 
   /// Gets the path to the root directory of the SDK.
   String get sdkDir =>
     path.dirname(path.dirname(Platform.executable));
 
   /// Gets the path to the dartdoc directory normalized for running in different
   /// places.
   String get normalizedDartdocPath => path.normalize(
       path.absolute(runningFromSdk ?
           path.join(sdkDir, 'lib', '_internal', 'dartdoc') :
@@ skipping 1521 matching lines @@
    return '''
         <div class="mdn">
         $mdnComment
         <div class="mdn-note"><a href="$mdnUrl">from MDN</a></div>
         </div>
         ''';
   }
 
   String toString() => mdnComment;
 }