Allow Directory.create to create all missing path components.

sdk/lib/_internal/dartdoc/lib/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 57 matching lines @@
 // the feature is supported.
 Path get scriptDir =>
     new Path.fromNative(new Options().script).directoryPath;
 
 /**
  * Deletes and recreates the output directory at [path] if it exists.
  */
 void cleanOutputDirectory(Path path) {
   final outputDir = new Directory.fromPath(path);
   if (outputDir.existsSync()) {
-    outputDir.deleteRecursivelySync();
+    outputDir.deleteSync(recursive: true);
   }
 
   try {
     // TODO(3914): Hack to avoid 'file already exists' exception thrown
     // due to invalid result from dir.existsSync() (probably due to race
     // conditions).
     outputDir.createSync();
   } on DirectoryIOException catch (e) {
     // Ignore.
   }
@@ skipping 468 matching lines @@
     final filePath = tmpPath.append('nav.dart');
     writeString(new File.fromPath(filePath),
         'get json => $dartString;');
   }
 
   Path get tmpPath => dartdocPath.append('tmp');
 
   void cleanup() {
     final dir = new Directory.fromPath(tmpPath);
     if (dir.existsSync()) {
-      dir.deleteRecursivelySync();
+      dir.deleteSync(recursive: true);
     }
   }
 
   List createNavigationInfo() {
     final libraryList = [];
     for (final library in _sortedLibraries) {
       docLibraryNavigationJson(library, libraryList);
     }
     return libraryList;
   }
@@ skipping 1289 matching lines @@
   final ClassMirror inheritedFrom;
 
   DocComment(this.text, [this.inheritedFrom = null]) {
     assert(text != null && !text.trim().isEmpty);
   }
 
   String get html => md.markdownToHtml(text);
 
   String toString() => text;
 }