tree 8b79dba1863638898c17c7890cb5705d54973ec5
parent 34df585a7623b4a12be892878aad44af594fa545
author nharper <nharper@google.com> 1559175858 -0700
committer Copybara-Service <copybara-worker@google.com> 1559341741 -0700

Refactor how TLS versions get enabled

This brings it closer in line to how QUIC_VERSION_99 is handled and sets up the
flag to be switched to a reloadable flag (blocked on being enabled). In particular,
AllSupportedVersions() now returns versions that include PROTOCOL_TLS1_3 for the
handshake_protocol.

When a TLS version is in use, it is safe to assume that
ParsedQuicVersion::KnowsWhichDecrypterToUse always returns true. This is because
KnowsWhichDecrypterToUse is enabled for QUIC_VERSION_47 and above, while TLS versions
only exist when CRYPTO frames are in use, which is currently only transport version 99.

gfe-relnote: refactor of TLS version code; protected by quic_supports_tls_handshake
PiperOrigin-RevId: 250599516
Change-Id: Ibfe68d74089ce29edeee219671c81e1643702000