cc: Make tiling interest rect calc based on viewport.

cc/test/impl_side_painting_settings.h

Index: cc/test/impl_side_painting_settings.h
diff --git a/cc/test/impl_side_painting_settings.h b/cc/test/impl_side_painting_settings.h
index 1ea7e7837d7789b83eb1d6b66fbdf97962e0ee43..11b13ad801f17fab5d310665262d272dcb9884e1 100644
--- a/cc/test/impl_side_painting_settings.h
+++ b/cc/test/impl_side_painting_settings.h
@@ -15,9 +15,9 @@ class ImplSidePaintingSettings : public LayerTreeSettings {
     impl_side_painting = true;
   }
 
-  explicit ImplSidePaintingSettings(int interest_rect_tiles) {
+  explicit ImplSidePaintingSettings(int viewport_multiplier) {
     impl_side_painting = true;
-    max_tiles_for_interest_area = interest_rect_tiles;
+    tiling_interest_area_viewport_multiplier = viewport_multiplier;
   }
 };