Revert of cc: Don't consider tiles at the layers raster_contents_scale incomplete

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index c8874e371ba695158224275521fb57c94aa4f303..0ec80686b8dc87069fd123bd1cb5cffb7084c3ef 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -298,14 +298,7 @@
           gfx::Rect opaque_rect = iter->opaque_rect();
           opaque_rect.Intersect(geometry_rect);
 
-          // The raster_contents_scale_ is the best scale that the layer is
-          // trying to produce, even though it may not be ideal. Since that's
-          // the best the layer can promise in the future, consider those as
-          // complete. But if a tile is ideal scale, we don't want to consider
-          // it incomplete and trying to replace it with a tile at a worse
-          // scale.
-          if (iter->contents_scale() != raster_contents_scale_ &&
-              iter->contents_scale() != ideal_contents_scale_ &&
+          if (iter->contents_scale() != ideal_contents_scale_ &&
               geometry_rect.Intersects(scaled_viewport_for_tile_priority)) {
             append_quads_data->num_incomplete_tiles++;
           }