Add SSL_early_data_reason_string.

QUICHE has a switch-case converting ssl_early_data_reason_t to a string
for logging. This causes a lot of churn when we add a new value.
Instead, add a function for this. Bump BORINGSSL_API_VERSION so we can
easily land a CL in QUICHE to start using the function without
coordinating repositories.

Change-Id: I176ca07b4f75a3ea7153a387219459665062aad9
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/43724
Reviewed-by: Nick Harper <nharper@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

ssl/ssl_lib.cc

diff --git a/ssl/ssl_lib.cc b/ssl/ssl_lib.cc
index 33b9f2f..a52f1fa 100644
--- a/ssl/ssl_lib.cc
+++ b/ssl/ssl_lib.cc
@@ -1294,6 +1294,43 @@
   return ssl->s3->early_data_reason;
 }
 
+const char *SSL_early_data_reason_string(enum ssl_early_data_reason_t reason) {
+  switch (reason) {
+    case ssl_early_data_unknown:
+      return "unknown";
+    case ssl_early_data_disabled:
+      return "disabled";
+    case ssl_early_data_accepted:
+      return "accepted";
+    case ssl_early_data_protocol_version:
+      return "protocol_version";
+    case ssl_early_data_peer_declined:
+      return "peer_declined";
+    case ssl_early_data_no_session_offered:
+      return "no_session_offered";
+    case ssl_early_data_session_not_resumed:
+      return "session_not_resumed";
+    case ssl_early_data_unsupported_for_session:
+      return "unsupported_for_session";
+    case ssl_early_data_hello_retry_request:
+      return "hello_retry_request";
+    case ssl_early_data_alpn_mismatch:
+      return "alpn_mismatch";
+    case ssl_early_data_channel_id:
+      return "channel_id";
+    case ssl_early_data_token_binding:
+      return "token_binding";
+    case ssl_early_data_ticket_age_skew:
+      return "ticket_age_skew";
+    case ssl_early_data_quic_parameter_mismatch:
+      return "quic_parameter_mismatch";
+    case ssl_early_data_alps_mismatch:
+      return "alps_mismatch";
+  }
+
+  return nullptr;
+}
+
 static int bio_retry_reason_to_error(int reason) {
   switch (reason) {
     case BIO_RR_CONNECT: