Roll Observatory deps (charted -> ^0.3.0)

packages/analyzer/test/file_system/memory_file_system_test.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 test.memory_file_system;
 
 import 'dart:async';
 import 'dart:core' hide Resource;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 321 matching lines @@
 
   void test_hashCode() {
     source.hashCode;
   }
 
   void test_resolveRelative() {
     Uri relative = source.resolveRelativeUri(new Uri.file('bar/baz.dart'));
     expect(relative.path, '/foo/bar/baz.dart');
   }
 
+  void test_resolveRelative_dart() {
+    File file = provider.newFile('/sdk/lib/core/core.dart', '');
+    Source source = file.createSource(Uri.parse('dart:core'));
+    Uri resolved = source.resolveRelativeUri(Uri.parse('int.dart'));
+    expect(resolved.toString(), 'dart:core/int.dart');
+  }
+
   void test_shortName() {
     expect(source.shortName, 'test.dart');
   }
 }
 
 @reflectiveTest
 class MemoryFileSourceNotExistingTest {
   MemoryResourceProvider provider = new MemoryResourceProvider();
   Source source;
 
@@ skipping 202 matching lines @@
     return new Future.delayed(Duration.ZERO, computation);
   }
 
   _watchingFolder(String path, test(List<WatchEvent> changesReceived)) {
     Folder folder = provider.getResource(path);
     var changesReceived = <WatchEvent>[];
     folder.changes.listen(changesReceived.add);
     return test(changesReceived);
   }
 }