cc: Give non-drawing layers that are rasterized a lower priority.

cc/tiles/raster_tile_priority_queue_all.cc

Index: cc/tiles/raster_tile_priority_queue_all.cc
diff --git a/cc/tiles/raster_tile_priority_queue_all.cc b/cc/tiles/raster_tile_priority_queue_all.cc
index 0d54a592607ee0558de53349c83fdde3c0aaf86a..7630dca7b9bfc63c5173848786e71a87ab1037a4 100644
--- a/cc/tiles/raster_tile_priority_queue_all.cc
+++ b/cc/tiles/raster_tile_priority_queue_all.cc
@@ -21,6 +21,14 @@ class RasterOrderComparator {
       const std::unique_ptr<TilingSetRasterQueueAll>& b_queue) const {
     // Note that in this function, we have to return true if and only if
     // a is strictly lower priority than b.
+
+    // If only one of a or b is a tiling set from a non-drawing layer, then a is
+    // lower priority if it is from a non drawing layer, otherwise b is lower
+    // priority.
+    if (a_queue->is_non_drawing_layer() != b_queue->is_non_drawing_layer()) {
+      return a_queue->is_non_drawing_layer();
+    }
+
     const TilePriority& a_priority = a_queue->Top().priority();
     const TilePriority& b_priority = b_queue->Top().priority();
     bool prioritize_low_res = tree_priority_ == SMOOTHNESS_TAKES_PRIORITY;
@@ -63,8 +71,9 @@ void CreateTilingSetRasterQueues(
     PictureLayerTilingSet* tiling_set = layer->picture_layer_tiling_set();
     bool prioritize_low_res = tree_priority == SMOOTHNESS_TAKES_PRIORITY;
     std::unique_ptr<TilingSetRasterQueueAll> tiling_set_queue =
-        base::MakeUnique<TilingSetRasterQueueAll>(tiling_set,
-                                                  prioritize_low_res);
+        base::MakeUnique<TilingSetRasterQueueAll>(
+            tiling_set, prioritize_low_res,
+            layer->raster_even_if_not_in_rsll());
     // Queues will only contain non empty tiling sets.
     if (!tiling_set_queue->IsEmpty())
       queues->push_back(std::move(tiling_set_queue));