Notify QuicTransportClientSession users when creating new streams is possible.
gfe-relnote: n/a (not used in production)
PiperOrigin-RevId: 288543454
Change-Id: I581abdcc7dcdb11285c47f4d1ef6f8ce34454c63
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.