Implement Token Binding negotiation TLS extension

net/ssl/ssl_info.h

Index: net/ssl/ssl_info.h
diff --git a/net/ssl/ssl_info.h b/net/ssl/ssl_info.h
index 28ce82d0ae6cb1ddf7a20f6ab9fd47dfe6075903..f22adaf0df6be82090c4df34365bd49eab10f386 100644
--- a/net/ssl/ssl_info.h
+++ b/net/ssl/ssl_info.h
@@ -82,6 +82,10 @@ class NET_EXPORT SSLInfo {
   // True if a channel ID was sent to the server.
   bool channel_id_sent;
 
+  // True if Token Binding was negotiated with the server and we agreed on a
+  // version and key params.
+  bool token_binding_negotiated;
+
   HandshakeType handshake_type;
 
   // The hashes, in several algorithms, of the SubjectPublicKeyInfos from