Perform ClientHello padding if the field trial is enabled

net/ssl/ssl_config.h

Index: net/ssl/ssl_config.h
diff --git a/net/ssl/ssl_config.h b/net/ssl/ssl_config.h
index 2cbc99568bc170877a45514cffa3d5f771e773b3..c3dc9b9fef25ad6b27ec452a2327f14063499d59 100644
--- a/net/ssl/ssl_config.h
+++ b/net/ssl/ssl_config.h
@@ -159,6 +159,16 @@ struct NET_EXPORT SSLConfig {
   NextProtoVector next_protos;
 
   scoped_refptr<X509Certificate> client_cert;
+
+  // Information about how to proceed with fastradio padding.
+  // |fastradio_padding_enabled| determines if the feature is enabled globally.
+  // |fastradio_padding_eligible| determines if the endpoint associated with
+  // this config should use it.
+  // |fastradio_padding_eligible| can be true when |fastradio_padding_enabled|
+  // is false: in this case, fastradio padding would not be enabled, but
+  // metrics can be collected for experiments.
+  bool fastradio_padding_enabled;
+  bool fastradio_padding_eligible;
 };
 
 }  // namespace net