Move some of IOThread's command line logic to network_session_configurator.

components/network_session_configurator/common/network_switches.cc

+// Copyright 2017 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 "components/network_session_configurator/common/network_switches.h"
+
+#include "base/command_line.h"
+
+namespace switches {
+
+#define NETWORK_SWITCH(name, value) const char name[] = value;
+#include "components/network_session_configurator/common/network_switch_list.h"
+#undef NETWORK_SWITCH
+
+}  // namespace switches
+
+namespace network_session_configurator {
+
+void CopyNetworkSwitches(const base::CommandLine& src_command_line,
+                         base::CommandLine* dest_command_line) {
+  static const char* const kSwitchNames[] = {
+#define NETWORK_SWITCH(name, value) switches::name,
+#include "components/network_session_configurator/common/network_switch_list.h"
+#undef NETWORK_SWITCH
+  };
+
+  dest_command_line->CopySwitchesFrom(src_command_line, kSwitchNames,
+                                      arraysize(kSwitchNames));
+}
+
+}  // namespace network_session_configurator