Summary: Implement some very basic benchmarking infra. We need benchmarks in css-layout and I want to add something now so that others have the option to follow an example when implementing a benchmark.
Reviewed By: lucasr
Differential Revision: D3648889
fbshipit-source-id: 60b93c6e5ed027a37195a9a5d86e681e3e79a5b9
