Perform ClientHello padding if the field trial is enabled

net/socket/ssl_client_socket_openssl.cc

Index: net/socket/ssl_client_socket_openssl.cc
diff --git a/net/socket/ssl_client_socket_openssl.cc b/net/socket/ssl_client_socket_openssl.cc
index c4af9575f1e447939f3e76fbce7f43fd4896cf92..3a0126f5ca11146c2e3100cadad8716b682843f5 100644
--- a/net/socket/ssl_client_socket_openssl.cc
+++ b/net/socket/ssl_client_socket_openssl.cc
@@ -474,12 +474,18 @@ int SSLClientSocketOpenSSL::Connect(const CompletionCallback& callback) {
   if (rv != OK) {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_CONNECT, rv);
     UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error", std::abs(rv));
+    if (ssl_config_.fastradio_padding_eligible)
+      UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error_ClientPadding",
+                                  std::abs(rv));
     return rv;
   }
 
   // Set SSL to client mode. Handshake happens in the loop below.
   SSL_set_connect_state(ssl_);
 
+  // Enable fastradio padding.
+  SSL_enable_fastradio_padding(ssl_, ssl_config_.enable_fastradio_padding);
+
   GotoState(STATE_HANDSHAKE);
   rv = DoHandshakeLoop(OK);
   if (rv == ERR_IO_PENDING) {
@@ -487,6 +493,9 @@ int SSLClientSocketOpenSSL::Connect(const CompletionCallback& callback) {
   } else {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_CONNECT, rv);
     UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error", std::abs(rv));
+    if (ssl_config_.fastradio_padding_eligible)
+      UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error_ClientPadding",
+                                  std::abs(rv));
     if (rv < OK)
       OnHandshakeCompletion();
   }
@@ -1367,6 +1376,9 @@ void SSLClientSocketOpenSSL::OnHandshakeIOComplete(int result) {
   if (rv != ERR_IO_PENDING) {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_CONNECT, rv);
     UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error", std::abs(rv));
+    if (ssl_config_.fastradio_padding_eligible)
+      UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error_ClientPadding",
+                                  std::abs(rv));
     DoConnectCallback(rv);
   }
 }