Ensure that enqueuemapped's mapper gets deps

Previously, we weren't injecting dependencies into the Mapper in the
enqueue-mapped handler.  This makes more complicated to things that
require clients, etc.

pkg/handler/enqueue_mapped.go

@@ -22,6 +22,7 @@ import (
 	"k8s.io/client-go/util/workqueue"
 	"sigs.k8s.io/controller-runtime/pkg/event"
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
 )
 
 var _ EventHandler = &EnqueueRequestsFromMapFunc{}
@@ -68,6 +69,16 @@ func (e *EnqueueRequestsFromMapFunc) mapAndEnqueue(q workqueue.RateLimitingInter
 	}
 }
 
+// EnqueueRequestsFromMapFunc can inject fields into the mapper.
+
+// InjectFunc implements inject.Injector.
+func (e *EnqueueRequestsFromMapFunc) InjectFunc(f inject.Func) error {
+	if f == nil {
+		return nil
+	}
+	return f(e.ToRequests)
+}
+
 // Mapper maps an object to a collection of keys to be enqueued
 type Mapper interface {
 	// Map maps an object