cc : Move LayerImpl::parent to test properties

cc/layers/layer_impl_test_properties.cc

Index: cc/layers/layer_impl_test_properties.cc
diff --git a/cc/layers/layer_impl_test_properties.cc b/cc/layers/layer_impl_test_properties.cc
index 631272d7f95e87c86b44b5be126437ec98e93647..dd2e26885af3c3207ba7998cd9ada2a64af8f94d 100644
--- a/cc/layers/layer_impl_test_properties.cc
+++ b/cc/layers/layer_impl_test_properties.cc
@@ -24,7 +24,8 @@ LayerImplTestProperties::LayerImplTestProperties(LayerImpl* owning_layer)
       scroll_parent(nullptr),
       clip_parent(nullptr),
       mask_layer(nullptr),
-      replica_layer(nullptr) {}
+      replica_layer(nullptr),
+      parent(nullptr) {}
 
 LayerImplTestProperties::~LayerImplTestProperties() {}
 
@@ -44,7 +45,7 @@ void LayerImplTestProperties::SetReplicaLayer(
   }
   replica_layer = replica.get();
   if (replica) {
-    replica->SetParent(owning_layer);
+    replica->test_properties()->parent = owning_layer;
     owning_layer->layer_tree_impl()->AddLayer(std::move(replica));
   }
 }