tree 68bd5340c70267e5bed3a0e935462da642ebb311
parent 9386be8fb09bf8bc2d1692f70f17b61700c9ce1d
author bnc <bnc@google.com> 1646950492 -0800
committer Copybara-Service <copybara-worker@google.com> 1646950540 -0800

Move mutex and testvalue from quic/platform/impl to quiche/common/platform/impl.

I'm lumping these together because these are the only ones in quic/platform that
have a default implementation.

PiperOrigin-RevId: 433848898