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..391999fd99f65d6d7af4519a149abb5a799a9370 100644
--- a/net/socket/ssl_client_socket_openssl.cc
+++ b/net/socket/ssl_client_socket_openssl.cc
@@ -18,7 +18,6 @@
 #include "base/environment.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
-#include "base/metrics/sparse_histogram.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_piece.h"
 #include "base/synchronization/lock.h"
@@ -473,20 +472,23 @@ int SSLClientSocketOpenSSL::Connect(const CompletionCallback& callback) {
   int rv = Init();
   if (rv != OK) {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_CONNECT, rv);
-    UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error", 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_.fastradio_padding_enabled &&
+                                   ssl_config_.fastradio_padding_eligible);
+
   GotoState(STATE_HANDSHAKE);
   rv = DoHandshakeLoop(OK);
   if (rv == ERR_IO_PENDING) {
     user_connect_callback_ = callback;
   } else {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_CONNECT, rv);
-    UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSL_Connection_Error", std::abs(rv));
     if (rv < OK)
       OnHandshakeCompletion();
   }
@@ -1366,7 +1368,6 @@ void SSLClientSocketOpenSSL::OnHandshakeIOComplete(int result) {
   int rv = DoHandshakeLoop(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));
     DoConnectCallback(rv);
   }
 }