Add createKernelResolutionEnqueuerListener to kernel/closed_world_test

pkg/compiler/lib/src/js_backend/resolution_listener.dart

Index: pkg/compiler/lib/src/js_backend/resolution_listener.dart
diff --git a/pkg/compiler/lib/src/js_backend/resolution_listener.dart b/pkg/compiler/lib/src/js_backend/resolution_listener.dart
index 4129afa43cb16cf880dd0bb5d9722b71b2d625c7..e1085c04f5ba8b245aee3ac59a67f26211886c3d 100644
--- a/pkg/compiler/lib/src/js_backend/resolution_listener.dart
+++ b/pkg/compiler/lib/src/js_backend/resolution_listener.dart
@@ -62,7 +62,6 @@ class ResolutionEnqueuerListener extends EnqueuerListener {
   bool _isLoadLibraryFunctionResolved = false;
 
   ResolutionEnqueuerListener(
-      this._kernelTask,
       this._options,
       this._elementEnvironment,
       this._commonElements,
@@ -79,7 +78,8 @@ class ResolutionEnqueuerListener extends EnqueuerListener {
       this._lookupMapResolutionAnalysis,
       this._mirrorsAnalysis,
       this._typeVariableResolutionAnalysis,
-      this._nativeEnqueuer);
+      this._nativeEnqueuer,
+      [this._kernelTask]);
 
   void _registerBackendImpact(
       WorldImpactBuilder builder, BackendImpact impact) {
@@ -214,7 +214,7 @@ class ResolutionEnqueuerListener extends EnqueuerListener {
     if (!enqueuer.queueIsEmpty) return false;
 
     if (_options.useKernel) {
-      _kernelTask.buildKernelIr();
+      _kernelTask?.buildKernelIr();

[Emily Fortuna, 2017/03/28 18:32:36]

if the option for useKernel is true, and kernelTask is null, don't we actually
want to throw an error instead?

[Johnni Winther, 2017/03/29 09:07:07]

Not for testing. Here we might want to use kernel but not build it (because it
is already built or loaded).

     }
 
     _mirrorsAnalysis.onQueueEmpty(enqueuer, recentClasses);