Add _sdkext support back to analysis server

pkg/analysis_server/lib/src/context_manager.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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:core' hide Resource;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/server_options.dart';
 import 'package:analysis_server/uri/resolver_provider.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
 import 'package:analyzer/source/package_map_provider.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/source/path_filter.dart';
 import 'package:analyzer/source/pub_package_map_provider.dart';
+import 'package:analyzer/source/sdk_ext.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:package_config/packages.dart';
 import 'package:package_config/packages_file.dart' as pkgfile show parse;
 import 'package:package_config/src/packages_impl.dart' show MapPackages;
 import 'package:path/path.dart' as pathos;
 import 'package:watcher/watcher.dart';
 import 'package:yaml/yaml.dart';
@@ skipping 1313 matching lines @@
   final String packageRoot;
 
   PackageMapDisposition(this.packageMap, {this.packageRoot});
 
   @override
   Packages get packages => null;
 
   @override
   Iterable<UriResolver> createPackageUriResolvers(
           ResourceProvider resourceProvider) =>
-      <UriResolver>[new PackageMapUriResolver(resourceProvider, packageMap)];
+      <UriResolver>[new SdkExtUriResolver(packageMap),
+                    new PackageMapUriResolver(resourceProvider, packageMap)];
 }
 
 /**
  * Concrete [FolderDisposition] object indicating that the context for a given
  * folder should resolve packages using a ".packages" file.
  */
 class PackagesFileDisposition extends FolderDisposition {
   @override
   final Packages packages;
 
   PackagesFileDisposition(this.packages) {}
 
   @override
   String get packageRoot => null;
 
   @override
   Iterable<UriResolver> createPackageUriResolvers(
-          ResourceProvider resourceProvider) =>
-      const <UriResolver>[];
+          ResourceProvider resourceProvider) {
+    if (packages != null) {
+      // Construct package map for the SdkExtUriResolver.
+      Map<String, List<Folder>> packageMap = <String, List<Folder>>{};
+      packages.asMap().forEach((String name, Uri uri) {
+        if (uri.scheme == 'file' || uri.scheme == '' /* unspecified */) {
+          packageMap[name] =
+              <Folder>[resourceProvider.getFolder(uri.toFilePath())];

[Paul Berry, 2015/08/13 17:12:07]

This will cause unit testing problems because uri.toFilePath() chooses whether
to create a Windows or a Posix file path based on the OS, but in unit tests we
override this sometimes.  Use resourceProvider.pathContext.fromUri(uri) instead.

[Cutch, 2015/08/13 19:24:17]

Done.

+        }
+      });
+      return <UriResolver>[new SdkExtUriResolver(packageMap)];
+    } else {
+      return const <UriResolver>[];
+    }
+  }
 }