Perform ClientHello padding if the field trial is enabled

net/ssl/ssl_socket_config_service.cc

+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/ssl/ssl_socket_config_service.h"
+
+#include <string>
+#include "net/base/host_port_pair.h"
+
+namespace {
+const char* kGoogleDomain = ".google.com";
+}
+
+namespace net {
+
+void SSLSocketConfigService::EnableFastRadioPadding() {
+  enabled_ = true;
+}
+
+void SSLSocketConfigService::DisableFastRadioPadding() {
+  enabled_ = false;
+}
+
+bool SSLSocketConfigService::UseFastRadioPadding(
+    const HostPortPair& host_and_port) {
+  if (!enabled_)
+    return false;
+
+  return IsGoogle(host_and_port);
+}
+
+bool SSLSocketConfigService::IsGoogle(const HostPortPair& host_and_port) {
+  const std::string& host = host_and_port.host();
+  bool is_google =
+      host == kGoogleDomain ||
+      (host.size() > 11 && host.rfind(kGoogleDomain) == host.size() - 11);
+  return is_google;
+}
+
+}  // namespace net