Perform ClientHello padding if the field trial is enabled

net/socket/ssl_client_socket_openssl.h

Index: net/socket/ssl_client_socket_openssl.h
diff --git a/net/socket/ssl_client_socket_openssl.h b/net/socket/ssl_client_socket_openssl.h
index 6aaf1e16672d65dc753da56ded07c2e90f546a34..bb229f9c3abdd0e6519e1350427d16482c196a72 100644
--- a/net/socket/ssl_client_socket_openssl.h
+++ b/net/socket/ssl_client_socket_openssl.h
@@ -40,6 +40,7 @@ class CTVerifier;
 class SingleRequestCertVerifier;
 class SSLCertRequestInfo;
 class SSLInfo;
+class SSLSocketConfigService;
 
 // An SSL client socket implemented with OpenSSL.
 class SSLClientSocketOpenSSL : public SSLClientSocket {
@@ -259,6 +260,9 @@ class SSLClientSocketOpenSSL : public SSLClientSocket {
   // The service for retrieving Channel ID keys.  May be NULL.
   ChannelIDService* channel_id_service_;
 
+  // The service for configuring features on the SSL socket. May be NULL.
+  SSLSocketConfigService* ssl_socket_config_service_;
+
   // Callback that is invoked when the connection finishes.
   //
   // Note: this callback will be run in Disconnect(). It will not alter