gfe-relnote: Add QuicParsedVersion::HasHeaderProtection method. Currently unused; not flag protected.

This change will enable landing code in chromium that is gated behind this version feature before cl/234202553 lands.

PiperOrigin-RevId: 246190639
Change-Id: If5eb208dff74f37095649301c52bb6058caa194b

quic/core/quic_versions.cc

diff --git a/quic/core/quic_versions.cc b/quic/core/quic_versions.cc
index a6d237e..8168a6a 100644
--- a/quic/core/quic_versions.cc
+++ b/quic/core/quic_versions.cc
@@ -49,6 +49,10 @@
          handshake_protocol == PROTOCOL_TLS1_3;
 }
 
+bool ParsedQuicVersion::HasHeaderProtection() const {
+  return transport_version == QUIC_VERSION_99;
+}
+
 std::ostream& operator<<(std::ostream& os, const ParsedQuicVersion& version) {
   os << ParsedQuicVersionToString(version);
   return os;

quic/core/quic_versions.h

diff --git a/quic/core/quic_versions.h b/quic/core/quic_versions.h
index 8da7361..00bbb32 100644
--- a/quic/core/quic_versions.h
+++ b/quic/core/quic_versions.h
@@ -151,6 +151,9 @@
   // Indicates that this QUIC version does not have an enforced minimum value
   // for flow control values negotiated during the handshake.
   bool AllowsLowFlowControlLimits() const;
+
+  // Returns whether header protection is used in this version of QUIC.
+  bool HasHeaderProtection() const;
 };
 
 QUIC_EXPORT_PRIVATE ParsedQuicVersion UnsupportedQuicVersion();