Build property trees for the HUD layer when using layer lists

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 8b0976ddfaa674473b8921f232d0eea4036e938f..b8904fffa2f82fcc211fddfd05eedc579489c72e 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -688,6 +688,10 @@ bool LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
           "cc", "LayerTreeHostInProcess::UpdateLayers_ReceivedPropertyTrees",
           TRACE_EVENT_SCOPE_THREAD, "property_trees",
           property_trees->AsTracedValue());
+      // The HUD layer is managed outside the layer list sent to LayerTreeHost
+      // and needs to have its property tree state initialized.
+      if (hud_layer_.get())
+        root_layer->copyPropertyTreeStateTo(hud_layer_.get());
     }
     draw_property_utils::UpdatePropertyTrees(this, property_trees,
                                              can_render_to_separate_surface);