cc::Fix computation of surface backfacing-ness when using property trees

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 2ea5b2ad8c9a0896120fbd96704e5914a7750276..dc6fba06608c9110e973c118459c713b89cd258b 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -6056,6 +6056,7 @@ TEST_F(LayerTreeHostCommonTest, DoNotIncludeBackfaceInvisibleSurfaces) {
   rotation_transform.RotateAboutXAxis(180.0);
 
   render_surface->SetTransform(rotation_transform);
+  root->layer_tree_impl()->property_trees()->needs_rebuild = true;
 
   ExecuteCalculateDrawProperties(root);