Add a QuicCoalescedPacket::ToString which will be used for net-log in chrome.
gfe-relnote: n/a (logging only)
PiperOrigin-RevId: 304000959
Change-Id: I989dfecb3c5c05ea86d3f2e285dd3e5a6c265b8c
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.