Summary: Overrides the default serializer and deserializer for the Layout Plugin. This diff uses `JSON.stringify` and `JSON.parse` to serialize and deserialize the object respectively. It turns out the our custom serializer is slower than the `JSON.stringify` and the export is way quicker.
Reviewed By: danielbuechele
Differential Revision: D17402443
fbshipit-source-id: 0d36783858ec1972130bdbc57ba7d3cdc5a73774
98bc01618f