Add stub versions of KernelInferrerEngine and friends

pkg/compiler/lib/src/backend_strategy.dart

Index: pkg/compiler/lib/src/backend_strategy.dart
diff --git a/pkg/compiler/lib/src/backend_strategy.dart b/pkg/compiler/lib/src/backend_strategy.dart
index 432926636240ad592762e99f3402ccbcb79b71ed..aabc367dc0f5b180293160e9f0daf5de7ef284fe 100644
--- a/pkg/compiler/lib/src/backend_strategy.dart
+++ b/pkg/compiler/lib/src/backend_strategy.dart
@@ -14,6 +14,7 @@ import 'js_backend/js_backend.dart';
 import 'js_backend/native_data.dart';
 import 'js_emitter/sorter.dart';
 import 'ssa/ssa.dart';
+import 'types/types.dart';
 import 'universe/world_builder.dart';
 import 'world.dart';
 
@@ -48,4 +49,10 @@ abstract class BackendStrategy {
 
   /// Creates a [SourceSpan] from [spannable] in context of [currentElement].
   SourceSpan spanFromSpannable(Spannable spannable, Entity currentElement);
+
+  TypesInferrer createTypesInferrer(ClosedWorldRefiner closedWorldRefiner,
+      {bool disableTypeInference: false});
+
+  GlobalTypeInferenceResults createTypesInferrerResults(

[Siggi Cherem (dart-lang), 2017/08/09 16:22:42]

does this need to be in this strategy? Can't it be a result from TypesInferrer
directly?

[Johnni Winther, 2017/08/10 09:00:49]

Good idea. Done.

+      TypesInferrer typesInferrer, ClosedWorld closedWorld);
 }