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

pkg/code_transformers/lib/src/dart_sdk.dart

Index: pkg/code_transformers/lib/src/dart_sdk.dart
diff --git a/pkg/code_transformers/lib/src/dart_sdk.dart b/pkg/code_transformers/lib/src/dart_sdk.dart
index 98f09e9534480e382dde1eeb5d8895edd192bb0a..652c4dfc083b94088dbeed50ca379e2876f0da1f 100644
--- a/pkg/code_transformers/lib/src/dart_sdk.dart
+++ b/pkg/code_transformers/lib/src/dart_sdk.dart
@@ -145,7 +145,7 @@ class MockDartSdk implements DartSdk {
   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) {
@@ -208,18 +208,3 @@ class _MockSdkSource implements UriAnnotatedSource {
   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)]);
-  }
-}