cc : Compute render surface is_clipped outside property tree building

cc/trees/occlusion_tracker_unittest.cc

Index: cc/trees/occlusion_tracker_unittest.cc
diff --git a/cc/trees/occlusion_tracker_unittest.cc b/cc/trees/occlusion_tracker_unittest.cc
index 7412de20078f5a1aaeee92633091f579cf473e92..7da646885f929f8315bbe2ea9bd11b240f4543e2 100644
--- a/cc/trees/occlusion_tracker_unittest.cc
+++ b/cc/trees/occlusion_tracker_unittest.cc
@@ -216,8 +216,6 @@ class OcclusionTrackerTest : public testing::Test {
     // iterations, so rebuild property trees every time.
     root->layer_tree_impl()->property_trees()->needs_rebuild = true;
 
-    FakeLayerTreeHostImpl::RecursiveUpdateNumChildren(root);
-
     LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
         root, root->bounds(), &render_surface_layer_list_impl_);
     inputs.can_adjust_raster_scales = true;