Support for excluded files/folders.

pkg/analyzer/test/file_system/physical_resource_provider_test.dart

Index: pkg/analyzer/test/file_system/physical_resource_provider_test.dart
diff --git a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
index 75bfcb2a31de49a5adb886b4d43464869a4693ac..4a573014072d2092684dde2b9eadf9f1bf0372cc 100644
--- a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
+++ b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
@@ -173,6 +173,12 @@ main() {
           expect(file == file2, isFalse);
         });
 
+        test('isOrContains', () {
+          File file = PhysicalResourceProvider.INSTANCE.getResource(path);
+          expect(file.isOrContains(path), isTrue);
+          expect(file.isOrContains('foo'), isFalse);
+        });
+
         test('shortName', () {
           expect(file.shortName, 'file.txt');
         });
@@ -222,6 +228,13 @@ main() {
           expect(folder.contains(path), isFalse);
         });
 
+        test('isOrContains', () {
+          expect(folder.isOrContains(path), isTrue);
+          expect(folder.isOrContains(join(path, 'aaa.txt')), isTrue);
+          expect(folder.isOrContains(join(path, 'aaa', 'bbb.txt')), isTrue);
+          expect(folder.isOrContains(join(tempPath, 'baz.txt')), isFalse);
+        });
+
         group('getChild', () {
           test('does not exist', () {
             var child = folder.getChild('no-such-resource');