Add non-null types list to StrongModeOptions

pkg/analyzer/test/src/task/strong/strong_test_helper.dart

Index: pkg/analyzer/test/src/task/strong/strong_test_helper.dart
diff --git a/pkg/analyzer/test/src/task/strong/strong_test_helper.dart b/pkg/analyzer/test/src/task/strong/strong_test_helper.dart
index ed14805304ff61c38d5f3b0271e94c0674e2973c..9c3609428f9fa6aea0e31efaa09659eb49b3b01a 100644
--- a/pkg/analyzer/test/src/task/strong/strong_test_helper.dart
+++ b/pkg/analyzer/test/src/task/strong/strong_test_helper.dart
@@ -54,7 +54,10 @@ void addFile(String content, {String name: '/main.dart'}) {
 /// the file text.
 ///
 /// Returns the main resolved library. This can be used for further checks.
-CompilationUnit check({bool implicitCasts: true, bool implicitDynamic: true}) {
+CompilationUnit check(
+    {bool implicitCasts: true,
+    bool implicitDynamic: true,
+    List<String> nonnullableTypes: AnalysisOptionsImpl.NONNULLABLE_TYPES}) {
   _checkCalled = true;
 
   expect(files.getFile('/main.dart').exists, true,
@@ -68,6 +71,7 @@ CompilationUnit check({bool implicitCasts: true, bool implicitDynamic: true}) {
   options.strongModeHints = true;
   options.implicitCasts = implicitCasts;
   options.implicitDynamic = implicitDynamic;
+  options.nonnullableTypes = nonnullableTypes;
   var mockSdk = new MockSdk();
   (mockSdk.context.analysisOptions as AnalysisOptionsImpl).strongMode = true;
   context.sourceFactory =