Update from https://crrev.com/306655

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index ebbe7f799f7e2143ffe11668fdf7198d491be26e..438344b2b9f209f8b1f904c413b7ea65393f4bc2 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -73,10 +73,13 @@ class CC_EXPORT LayerTreeSettings {
   bool strict_layer_property_change_checking;
   bool use_one_copy;
   bool use_zero_copy;
+  bool use_image_external;
   bool ignore_root_layer_flings;
   size_t scheduled_raster_task_limit;
   bool use_occlusion_for_tile_prioritization;
   bool record_full_layer;
+  bool use_display_lists;
+  bool main_thread_should_always_be_low_latency;
 
   LayerTreeDebugState initial_debug_state;
 };