Upon receiving SETTINGS for a QuicSpdyClientSession, serialize the frame and cache it in tls_client_handshaker.
gfe-relnote: unused code. not protected.
PiperOrigin-RevId: 306897017
Change-Id: I94fbf706b7c9846befb80b1363a79dc022e95828
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.