Call expect_flight and received_flight in the 1.3 logic.

This doesn't do anything since they're for DTLS, but we ought to satisfy
the API nonetheless. expect_flight is easy with
ssl_hs_flush_and_read_message. received_flight I think basically needs
to get sprinkled into the state machine.

Change-Id: I406c7f776ad8e5e3cbcafcac6b26a688c6d3caf1
Reviewed-on: https://boringssl-review.googlesource.com/8883
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

ssl/tls13_both.c

@@ -87,6 +87,7 @@ int tls13_handshake(SSL *ssl) {
         if (hs->wait != ssl_hs_flush_and_read_message) {
           break;
         }
+        ssl->method->expect_flight(ssl);
         hs->wait = ssl_hs_read_message;
         /* Fall-through. */
       }

ssl/tls13_client.c

@@ -394,6 +394,7 @@ static enum ssl_hs_wait_t do_process_server_finished(SSL *ssl,
     return ssl_hs_error;
   }
 
+  ssl->method->received_flight(ssl);
   hs->state = state_certificate_callback;
   return ssl_hs_ok;
 }

ssl/tls13_server.c

@@ -215,6 +215,8 @@ static enum ssl_hs_wait_t do_process_client_hello(SSL *ssl, SSL_HANDSHAKE *hs) {
   ssl->session->cipher = cipher;
   ssl->s3->tmp.new_cipher = cipher;
 
+  ssl->method->received_flight(ssl);
+
   /* The PRF hash is now known. Set up the key schedule and hash the
    * ClientHello. */
   size_t hash_len =
@@ -296,6 +298,7 @@ static enum ssl_hs_wait_t do_process_second_client_hello(SSL *ssl,
     return ssl_hs_error;
   }
 
+  ssl->method->received_flight(ssl);
   hs->state = state_send_server_hello;
   return ssl_hs_ok;
 }
@@ -495,6 +498,7 @@ static enum ssl_hs_wait_t do_process_client_finished(SSL *ssl,
     return ssl_hs_error;
   }
 
+  ssl->method->received_flight(ssl);
   hs->state = state_done;
   return ssl_hs_ok;
 }