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 43a8f328b557717403f865c45327735fce1d859b..694b0134b3ab0872d4d010189ad7e4f4bcc1a4fc 100644
--- a/cc/trees/property_tree.h
+++ b/cc/trees/property_tree.h
@@ -192,6 +192,7 @@ 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;
@@ -398,6 +399,7 @@ class CC_EXPORT PropertyTrees final {
   EffectTree effect_tree;
   ClipTree clip_tree;
   bool needs_rebuild;
+  bool non_root_surfaces_enabled;
   int sequence_number;
 };