Add a toUri method to Resource

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 939882283488e8295bb92ee53d7d47e09b347645..e1f4a0029b2cb01ed223df9c4444d6832f990fb9 100644
--- a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
+++ b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
@@ -180,6 +180,12 @@ class FileTest extends _BaseTest {
     expect(file.exists, isTrue);
   }
 
+  void test_toUri() {
+    String path = '/foo/file.txt';
+    File file = PhysicalResourceProvider.INSTANCE.getFile(path);
+    expect(file.toUri(), new Uri.file(path));
+  }
+
   void test_shortName() {
     expect(file.shortName, 'file.txt');
   }
@@ -373,6 +379,12 @@ class FolderTest extends _BaseTest {
       parent = grandParent;
     }
   }
+
+  void test_toUri() {
+    String path = '/foo/directory';
+    Folder folder = PhysicalResourceProvider.INSTANCE.getFolder(path);
+    expect(folder.toUri(), new Uri.directory(path));
+  }
 }
 
 @reflectiveTest