cc: Move prepaint region calculations to the tiling set.

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index 0ed9ee9f5a7dc1c398fa19d049c837c8374b4bd5..34b1b8b71661e63412cc4d701c2ea39c7b7f4458 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -73,9 +73,9 @@ class CC_EXPORT LayerTreeSettings {
   gfx::Size default_tile_size;
   gfx::Size max_untiled_layer_size;
   gfx::Size minimum_occlusion_tracking_size;
-  size_t tiling_interest_area_padding;
+  int tiling_interest_area_padding;
   float skewport_target_time_in_seconds;
-  int skewport_extrapolation_limit_in_content_pixels;
+  int skewport_extrapolation_limit_in_screen_pixels;
   size_t max_memory_for_prepaint_percentage;
   bool use_zero_copy;
   bool use_partial_raster;