Hit test on the layer tree rather than the RSLL

cc/layers/draw_properties.h

Index: cc/layers/draw_properties.h
diff --git a/cc/layers/draw_properties.h b/cc/layers/draw_properties.h
index 5fd42a49e94ca673599a1841e116fa45238ce26a..5b6424d13eaff4ddf79a6ba5a6d6017753d2b0e3 100644
--- a/cc/layers/draw_properties.h
+++ b/cc/layers/draw_properties.h
@@ -31,6 +31,7 @@ struct CC_EXPORT DrawProperties {
         layer_or_descendant_has_copy_request(false),
         has_child_with_a_scroll_parent(false),
         sorted_for_recursion(false),
+        is_in_layer_list(false),
         index_of_first_descendants_addition(0),
         num_descendants_added(0),
         index_of_first_render_surface_layer_list_addition(0),
@@ -111,6 +112,10 @@ struct CC_EXPORT DrawProperties {
   // layer will be visited while computing draw properties has been determined.
   bool sorted_for_recursion;
 
+  // This returns true if the layer has been included in some surface's layer
+  // list (i.e., this thing will draw).
+  bool is_in_layer_list;

[enne (OOO), 2014/05/06 20:30:58]

vmpstr is doing something like this as well in
https://codereview.chromium.org/265883013/

[Ian Vollick, 2014/05/06 21:06:20]

As we discussed offline, this is subsumed by vmpstr's patch, so I'll wait for
his to land. I'll upload a rebase against that patch as soon as I can.

+
   // If this layer is visited out of order, its contribution to the descendant
   // and render surface layer lists will be put aside in a temporary list.
   // These values will allow for an efficient reordering of these additions.