cc: Properly detect tiles that are needed now.

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 a197b1284380dc9f7c96dbae2bb65543cc550334..e5bea8960a76430e9235180a37c7401026278dd5 100644
--- a/cc/tiles/raster_tile_priority_queue_all.cc
+++ b/cc/tiles/raster_tile_priority_queue_all.cc
@@ -145,13 +145,16 @@ RasterTilePriorityQueueAll::GetNextQueues() const {
 
   switch (tree_priority_) {
     case SMOOTHNESS_TAKES_PRIORITY: {
-      // If we're down to eventually bin tiles on the active tree and there
-      // is a pending tree, process the entire pending tree to allow tiles
-      // required for activation to be initialized when memory policy only
-      // allows prepaint. The eventually bin tiles on the active tree are
-      // lowest priority since that work is likely to be thrown away when
-      // we activate.
-      if (active_priority.priority_bin == TilePriority::EVENTUALLY)
+      // If we're done with required tiles on the active tree, then process
+      // required tiles on the pending tree. If either the active tree has
+      // required tiles, or none of the trees have required tiles, then process
+      // the active tree by default.
+      bool active_tree_has_required_tiles =
+          active_tile.tile()->required_for_activation() ||
+          active_tile.tile()->required_for_draw();
+      bool pending_tree_has_required_tiles =
+          pending_tile.tile()->required_for_activation();
+      if (!active_tree_has_required_tiles && pending_tree_has_required_tiles)
         return pending_queues_;
       return active_queues_;
     }