Actual URI support for package URI resolution.

pkg/analyzer/lib/source/package_map_resolver.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 source.package_map_resolver;
 
 import 'dart:core' hide Resource;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 26 matching lines @@
    *
    * [packageMap] is a table mapping package names to the paths of the
    * directories containing the package
    */
   PackageMapUriResolver(this.resourceProvider, this.packageMap) {
     asserts.notNull(resourceProvider);
     asserts.notNull(packageMap);
   }
 
   @override
-  Source resolveAbsolute(Uri uri) {
+  Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     if (!isPackageUri(uri)) {
       return null;
     }
     // Prepare path.
     String path = uri.path;
     // Prepare path components.
     int index = path.indexOf('/');
     if (index == -1 || index == 0) {
       return null;
     }
@@ skipping 70 matching lines @@
     return true;
   }
 
   /**
    * Returns `true` if [uri] is a `package` URI.
    */
   static bool isPackageUri(Uri uri) {
     return uri.scheme == PACKAGE_SCHEME;
   }
 }