make ObjectInterfaces impl generic

staging/src/k8s.io/apiserver/pkg/admission/plugin/webhook/generic/conversion_test.go

@@ -42,7 +42,7 @@ func initiateScheme(t *testing.T) *runtime.Scheme {
 
 func TestConvertToGVK(t *testing.T) {
 	scheme := initiateScheme(t)
-	o := &admission.SchemeBasedObjectInterfaces{scheme}
+	o := admission.NewObjectInterfacesFromScheme(scheme)
 	table := map[string]struct {
 		obj         runtime.Object
 		gvk         schema.GroupVersionKind

staging/src/k8s.io/apiserver/pkg/admission/plugin/webhook/mutating/dispatcher_test.go

@@ -49,7 +49,7 @@ func TestDispatch(t *testing.T) {
 	require.NoError(t, example.AddToScheme(scheme))
 	require.NoError(t, examplev1.AddToScheme(scheme))
 	require.NoError(t, example2v1.AddToScheme(scheme))
-	objectInterfaces := &admission.SchemeBasedObjectInterfaces{scheme}
+	objectInterfaces := admission.NewObjectInterfacesFromScheme(scheme)
 
 	tests := []struct {
 		name        string

staging/src/k8s.io/apiserver/pkg/admission/plugin/webhook/testing/testcase.go

@@ -702,5 +702,5 @@ func newMatchEverythingRules() []registrationv1beta1.RuleWithOperations {
 func NewObjectInterfacesForTest() admission.ObjectInterfaces {
 	scheme := runtime.NewScheme()
 	corev1.AddToScheme(scheme)
-	return &admission.SchemeBasedObjectInterfaces{scheme}
+	return admission.NewObjectInterfacesFromScheme(scheme)
 }

staging/src/k8s.io/apiserver/pkg/admission/util.go

@@ -18,11 +18,26 @@ package admission
 
 import "k8s.io/apimachinery/pkg/runtime"
 
-type SchemeBasedObjectInterfaces struct {
-	Scheme *runtime.Scheme
+type RuntimeObjectInterfaces struct {
+	runtime.ObjectCreater
+	runtime.ObjectTyper
+	runtime.ObjectDefaulter
+	runtime.ObjectConvertor
 }
 
-func (r *SchemeBasedObjectInterfaces) GetObjectCreater() runtime.ObjectCreater     { return r.Scheme }
-func (r *SchemeBasedObjectInterfaces) GetObjectTyper() runtime.ObjectTyper         { return r.Scheme }
-func (r *SchemeBasedObjectInterfaces) GetObjectDefaulter() runtime.ObjectDefaulter { return r.Scheme }
-func (r *SchemeBasedObjectInterfaces) GetObjectConvertor() runtime.ObjectConvertor { return r.Scheme }
+func NewObjectInterfacesFromScheme(scheme *runtime.Scheme) ObjectInterfaces {
+	return &RuntimeObjectInterfaces{scheme, scheme, scheme, scheme}
+}
+
+func (r *RuntimeObjectInterfaces) GetObjectCreater() runtime.ObjectCreater {
+	return r.ObjectCreater
+}
+func (r *RuntimeObjectInterfaces) GetObjectTyper() runtime.ObjectTyper {
+	return r.ObjectTyper
+}
+func (r *RuntimeObjectInterfaces) GetObjectDefaulter() runtime.ObjectDefaulter {
+	return r.ObjectDefaulter
+}
+func (r *RuntimeObjectInterfaces) GetObjectConvertor() runtime.ObjectConvertor {
+	return r.ObjectConvertor
+}

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/rest_test.go

@@ -369,7 +369,7 @@ func (tc *patchTestCase) Run(t *testing.T) {
 	creater := runtime.ObjectCreater(scheme)
 	defaulter := runtime.ObjectDefaulter(scheme)
 	convertor := runtime.UnsafeObjectConvertor(scheme)
-	objectInterfaces := &admission.SchemeBasedObjectInterfaces{scheme}
+	objectInterfaces := admission.NewObjectInterfacesFromScheme(scheme)
 	kind := examplev1.SchemeGroupVersion.WithKind("Pod")
 	resource := examplev1.SchemeGroupVersion.WithResource("pods")
 	schemaReferenceObj := &examplev1.Pod{}