Use parseDirectives were possible. Also mark analyzer ready to be released.

pkg/code_transformers/lib/src/dart_sdk.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 code_transformers.src.dart_sdk;
 
 import 'dart:convert' as convert;
 import 'dart:io' show File, Platform, Process;
 import 'package:path/path.dart' as path;
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 127 matching lines @@
 
 
 /// Dart SDK which contains a mock implementation of the SDK libraries. May be
 /// used to speed up resultion when most of the core libraries is not needed.
 class MockDartSdk implements DartSdk {
   final Map<Uri, _MockSdkSource> _sources = {};
   final bool reportMissing;
   final Map<String, SdkLibrary> _libs = {};
   final String sdkVersion = '0';
   List<String> get uris => _sources.keys.map((uri) => '$uri').toList();
-  final AnalysisContext context = new _SdkAnalysisContext();
+  final AnalysisContext context = new SdkAnalysisContext();
 
   MockDartSdk(Map<String, String> sources, {this.reportMissing}) {
     sources.forEach((uriString, contents) {
       var uri = Uri.parse(uriString);
       _sources[uri] = new _MockSdkSource(uri, contents);
       _libs[uriString] = new SdkLibraryImpl(uri.path)
         ..setDart2JsLibrary()
         ..setVmLibrary();
     });
   }
@@ skipping 42 matching lines @@
 
   String get shortName => uri.path;
 
   UriKind get uriKind => UriKind.DART_URI;
 
   bool get isInSystemLibrary => true;
 
   Source resolveRelative(Uri relativeUri) =>
       throw new UnsupportedError('not expecting relative urls in dart: mocks');
 }
-
-// TODO(sigmund): delete once we bump the dependency on analyzer.  We copied
-// this code from SdkAnalysisContext in 'analyzer/src/generated/engine.dart' to
-// prevent bumping the dependency on analyzer. We should remove this as soon as
-// we start depending on analyzer >= 0.15.5.
-class _SdkAnalysisContext extends AnalysisContextImpl {
-  @override
-  AnalysisCache createCacheFromSourceFactory(SourceFactory factory) {
-    if (factory == null) return super.createCacheFromSourceFactory(factory);
-    var sdk = factory.dartSdk;
-    if (sdk == null) throw "Missing a DartUriResolver in source factory";
-    return new AnalysisCache(
-        [AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
-  }
-}