Add non-application-data SSL messages to NetLog.

net/socket/ssl_client_socket_impl.h

Index: net/socket/ssl_client_socket_impl.h
diff --git a/net/socket/ssl_client_socket_impl.h b/net/socket/ssl_client_socket_impl.h
index 019c1c57d08c4315564bd53f780734399504f1be..5eda4829628db8c28604eb8d95f98bfb52c20a0d 100644
--- a/net/socket/ssl_client_socket_impl.h
+++ b/net/socket/ssl_client_socket_impl.h
@@ -215,6 +215,12 @@ class SSLClientSocketImpl : public SSLClientSocket,
 
   void OnPrivateKeyComplete(Error error, const std::vector<uint8_t>& signature);
 
+  // Called whenever BoringSSL processes a protocol message.
+  void MessageCallback(int is_write,
+                       int content_type,
+                       const void* buf,
+                       size_t len);
+
   int TokenBindingAdd(const uint8_t** out,
                       size_t* out_len,
                       int* out_alert_value);