Add command-line control of the HSTS preload list.

net/base/net_switches.cc

+// Copyright (c) 2011 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/base/net_switches.h"
+
+namespace switches {
+
+// This switch will take the JSON-formatted HSTS specification and load it
+// as if it were a preloaded HSTS entry. It will take precedence over both
+// website-specified rules and built-in rules.
+// The JSON format is the same as that persisted in
+// <profile_dir>/Default/TransportSecurity
+const char kHstsHosts[]                  = "hsts-hosts";
+
+}  // namespace switches
+