Convert analysis server over to use ContextBuilder

pkg/analyzer/lib/file_system/physical_file_system.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.
 
 library analyzer.file_system.physical_file_system;
 
 import 'dart:async';
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
@@ skipping 199 matching lines @@
 
 /**
  * A `dart:io` based implementation of [Folder].
  */
 class _PhysicalFolder extends _PhysicalResource implements Folder {
   _PhysicalFolder(io.Directory directory) : super(directory);
 
   @override
   Stream<WatchEvent> get changes => new DirectoryWatcher(_entry.path).events;
 
+  /**
+   * Return the underlying file being represented by this wrapper.
+   */
+  io.Directory get _directory => _entry as io.Directory;
+
   @override
   String canonicalizePath(String relPath) {
     return normalize(join(path, relPath));
   }
 
   @override
   bool contains(String path) {
     return absolutePathContext.isWithin(this.path, path);
   }
 
@@ skipping 40 matching lines @@
 
   @override
   bool isOrContains(String path) {
     if (path == this.path) {
       return true;
     }
     return contains(path);
   }
 
   @override
+  Folder resolveSymbolicLinksSync() {
+    try {
+      return new _PhysicalFolder(
+          new io.Directory(_directory.resolveSymbolicLinksSync()));
+    } on io.FileSystemException catch (exception) {
+      throw new FileSystemException(exception.path, exception.message);
+    }
+  }
+
+  @override
   Uri toUri() => new Uri.directory(path);
 }
 
 /**
  * A `dart:io` based implementation of [Resource].
  */
 abstract class _PhysicalResource implements Resource {
   final io.FileSystemEntity _entry;
 
   _PhysicalResource(this._entry);
@@ skipping 70 matching lines @@
           timer.cancel();
         }
       });
       return completer.future;
     }
     _isSpawning = true;
     _runner = await IsolateRunner.spawn();
     return _runner;
   }
 }