cc : Remove parent for mask and replica layers in LayerImpl

cc/trees/damage_tracker_unittest.cc

Index: cc/trees/damage_tracker_unittest.cc
diff --git a/cc/trees/damage_tracker_unittest.cc b/cc/trees/damage_tracker_unittest.cc
index 743631f2bca1c67b190a74c7cc34cb1979a58048..bd878c4236d285e202cfc99beed574bf974c0abf 100644
--- a/cc/trees/damage_tracker_unittest.cc
+++ b/cc/trees/damage_tracker_unittest.cc
@@ -1392,6 +1392,8 @@ TEST_F(DamageTrackerTest, VerifyDamageForReplicaMaskWithTransformOrigin) {
     gfx::Transform reflection;
     reflection.Scale3d(-1.0, 1.0, 1.0);
     grand_child1_replica->SetTransform(reflection);
+    // We need to set parent on replica layer for property tree building.
+    grand_child1_replica->SetParent(grand_child1);
     grand_child1->SetReplicaLayer(std::move(grand_child1_replica));
     grand_child1->SetForceRenderSurface(true);
   }