Snapshot DDC trained on itself

pkg/dev_compiler/lib/src/analyzer/context.dart

 // Copyright (c) 2015, 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.
 
 import 'package:args/args.dart' show ArgParser, ArgResults;
 import 'package:analyzer/src/command_line/arguments.dart';
 import 'package:analyzer/file_system/file_system.dart'
     show ResourceProvider, ResourceUriResolver;
 import 'package:analyzer/file_system/physical_file_system.dart'
     show PhysicalResourceProvider;
@@ skipping 86 matching lines @@
               'library.dart as the source for an import of of "libraryUri".',
           allowMultiple: true,
           splitCommas: false);
   }
 
   static Map<String, String> _parseUrlMappings(Iterable argument) {
     var mappings = <String, String>{};
     for (var mapping in argument) {
       var splitMapping = mapping.split(',');
       if (splitMapping.length >= 2) {
-        mappings[splitMapping[0]] = path.absolute(splitMapping[1]);
+        mappings[splitMapping[0]] = path.canonicalize(splitMapping[1]);
       }
     }
     return mappings;
   }
 }
 
 /// Creates a SourceFactory configured by the [options].
 ///
 /// If supplied, [fileResolvers] will override the default `file:` and
 /// `package:` URI resolvers.
@@ skipping 29 matching lines @@
       builderOptions.defaultPackagesDirectoryPath = options.packageRoot;
     }
     ContextBuilder builder = new ContextBuilder(resourceProvider, null, null,
         options: builderOptions);
     return new PackageMapUriResolver(resourceProvider,
         builder.convertPackagesToMap(builder.createPackageMap('')));
   }
 
   return [new ResourceUriResolver(resourceProvider), packageResolver()];
 }