Migrate DDC to the new analysis driver.

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 134 matching lines @@
     ContextBuilderOptions builderOptions = new ContextBuilderOptions();
     if (options.packageRoot != null) {
       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()];
+  return [packageResolver(), new ResourceUriResolver(resourceProvider)];
 }