cc: Make property trees support resourceless draw mode

cc/trees/property_tree.h

Index: cc/trees/property_tree.h
diff --git a/cc/trees/property_tree.h b/cc/trees/property_tree.h
index e7457a19a06ecef3515354f3255ee7939ee31a8e..cb8a37b01e81323c7d023261d65dc88f7ea3abbd 100644
--- a/cc/trees/property_tree.h
+++ b/cc/trees/property_tree.h
@@ -196,6 +196,7 @@ struct CC_EXPORT ClipNodeData {
   // True if layers with this clip tree node need to be drawn with a clip
   // applied.
   bool layers_are_clipped : 1;
+  bool layers_are_clipped_when_surfaces_disabled : 1;
 
   // Nodes that correspond to unclipped surfaces disregard ancestor clips.
   bool resets_clip : 1;
@@ -402,6 +403,7 @@ class CC_EXPORT PropertyTrees final {
   EffectTree effect_tree;
   ClipTree clip_tree;
   bool needs_rebuild;
+  bool non_root_surfaces_enabled;
   int sequence_number;
 };