Notify quic crypto client handshaker about connection close. client side only, protected by existing gfe2_reloadable_flag_quic_notify_handshaker_on_connection_close.

PiperOrigin-RevId: 312677572
Change-Id: I3b36ec2193ceaa40d911abc1e1038cc4c587cc5e

quic/core/quic_crypto_client_handshaker.cc

diff --git a/quic/core/quic_crypto_client_handshaker.cc b/quic/core/quic_crypto_client_handshaker.cc
index e93fd07..b031011 100644
--- a/quic/core/quic_crypto_client_handshaker.cc
+++ b/quic/core/quic_crypto_client_handshaker.cc
@@ -171,6 +171,12 @@
   return QuicCryptoHandshaker::BufferSizeLimitForLevel(level);
 }
 
+void QuicCryptoClientHandshaker::OnConnectionClosed(
+    QuicErrorCode /*error*/,
+    ConnectionCloseSource /*source*/) {
+  next_state_ = STATE_CONNECTION_CLOSED;
+}
+
 void QuicCryptoClientHandshaker::HandleServerConfigUpdateMessage(
     const CryptoHandshakeMessage& server_config_update) {
   DCHECK(server_config_update.tag() == kSCUP);
@@ -236,6 +242,9 @@
         break;
       case STATE_NONE:
         QUIC_NOTREACHED();
+        return;
+      case STATE_CONNECTION_CLOSED:
+        rv = QUIC_FAILURE;
         return;  // We are done.
     }
   } while (rv != QUIC_PENDING && next_state_ != STATE_NONE);

quic/core/quic_crypto_client_handshaker.h

diff --git a/quic/core/quic_crypto_client_handshaker.h b/quic/core/quic_crypto_client_handshaker.h
index 5ba93f2..f99d36e 100644
--- a/quic/core/quic_crypto_client_handshaker.h
+++ b/quic/core/quic_crypto_client_handshaker.h
@@ -53,7 +53,7 @@
   void OnOneRttPacketAcknowledged() override {}
   void OnHandshakePacketSent() override {}
   void OnConnectionClosed(QuicErrorCode /*error*/,
-                          ConnectionCloseSource /*source*/) override {}
+                          ConnectionCloseSource /*source*/) override;
   void OnHandshakeDoneReceived() override;
   void OnApplicationState(
       std::unique_ptr<ApplicationState> /*application_state*/) override {
@@ -103,6 +103,7 @@
     STATE_RECV_SHLO,
     STATE_INITIALIZE_SCUP,
     STATE_NONE,
+    STATE_CONNECTION_CLOSED,
   };
 
   // Handles new server config and optional source-address token provided by the