Support for excluded files/folders.

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 physical_file_system;
 
 import 'dart:async';
 import 'dart:io' as io;
 
 import 'package:analyzer/src/generated/java_io.dart';
@@ skipping 37 matching lines @@
 
   @override
   Source createSource([Uri uri]) {
     io.File file = _entry as io.File;
     JavaFile javaFile = new JavaFile(file.absolute.path);
     if (uri == null) {
       uri = javaFile.toURI();
     }
     return new FileBasedSource.con2(uri, javaFile);
   }
+
+  @override
+  bool isOrContains(String path) {
+    return path == this.path;
+  }
 }
 
 
 /**
  * A `dart:io` based implementation of [Folder].
  */
 class _PhysicalFolder extends _PhysicalResource implements Folder {
   _PhysicalFolder(io.Directory directory) : super(directory);
 
   @override
@@ skipping 24 matching lines @@
     for (int i = 0; i < numEntries; i++) {
       io.FileSystemEntity entity = entries[i];
       if (entity is io.Directory) {
         children.add(new _PhysicalFolder(entity));
       } else if (entity is io.File) {
         children.add(new _PhysicalFile(entity));
       }
     }
     return children;
   }
+
+  @override
+  bool isOrContains(String path) {
+    if (path == this.path) {
+      return true;
+    }
+    return contains(path);
+  }
 }
 
 
 /**
  * A `dart:io` based implementation of [Resource].
  */
 abstract class _PhysicalResource implements Resource {
   final io.FileSystemEntity _entry;
 
   _PhysicalResource(this._entry);
@@ skipping 23 matching lines @@
   bool operator ==(other) {
     if (runtimeType != other.runtimeType) {
       return false;
     }
     return path == other.path;
   }
 
   @override
   String toString() => path;
 }