Handle static fields in js_model/model_test

pkg/compiler/lib/src/js_model/js_strategy.dart

Index: pkg/compiler/lib/src/js_model/js_strategy.dart
diff --git a/pkg/compiler/lib/src/js_model/js_strategy.dart b/pkg/compiler/lib/src/js_model/js_strategy.dart
index 8203349414e19eacc2c629dd9aedfd34e2536606..d2e2caad4fc81aa1767174c3ebade8e0ff3e3e9b 100644
--- a/pkg/compiler/lib/src/js_model/js_strategy.dart
+++ b/pkg/compiler/lib/src/js_model/js_strategy.dart
@@ -52,7 +52,8 @@ class JsBackendStrategy implements KernelBackendStrategy {
   GlobalLocalsMap get globalLocalsMapForTesting => _globalLocalsMap;
 
   @override
-  ClosedWorldRefiner createClosedWorldRefiner(ClosedWorld closedWorld) {
+  ClosedWorldRefiner createClosedWorldRefiner(
+      covariant ClosedWorldBase closedWorld) {
     KernelFrontEndStrategy strategy = _compiler.frontendStrategy;
     KernelToElementMapForImpact elementMap = strategy.elementMap;
     _elementMap = new JsKernelToElementMap(
@@ -112,7 +113,17 @@ class JsBackendStrategy implements KernelBackendStrategy {
       convertClassSet(closedWorld.getClassSet(cls));
     }, ClassHierarchyNode.ALL);
 
-    return new JsClosedWorld(
+    List<MemberEntity> liveInstanceMembers =
+        closedWorld.liveInstanceMembers.map(_map.toBackendMember).toList();
+
+    Map<ClassEntity, Set<ClassEntity>> mixinUses =
+        <ClassEntity, Set<ClassEntity>>{};
+    closedWorld.mixinUses.forEach((ClassEntity cls, Set<ClassEntity> uses) {
+      mixinUses[_map.toBackendClass(cls)] =
+          uses.map(_map.toBackendClass).toSet();
+    });
+
+    return new JsClosedWorld(_elementMap,
         elementEnvironment: _elementEnvironment,
         dartTypes: _elementMap.types,
         commonElements: _commonElements,
@@ -123,11 +134,11 @@ class JsBackendStrategy implements KernelBackendStrategy {
         classHierarchyNodes: classHierarchyNodes,
         classSets: classSets,
         implementedClasses: implementedClasses,
+        liveInstanceMembers: liveInstanceMembers,
         // TODO(johnniwinther): Support these.
         allTypedefs: new ImmutableEmptySet<TypedefElement>(),
         resolutionWorldBuilder: null,
-        functionSet: null,
-        mixinUses: null,
+        mixinUses: mixinUses,
         typesImplementedBySubclasses: null);
   }