Pulled from the commit at current master, overridden to build with clang
and enable gtest and gmock integration.
Change-Id: I10008e8c591bd0c7cc26566b2a050ef2a55bb346
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1282
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
