Revert 68944 - Revert "Add named testing interface."

chrome/common/automation_constants.cc

 // Copyright (c) 2006-2009 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 "chrome/common/automation_constants.h"
 
 namespace automation {
+
 // JSON value labels for proxy settings that are passed in via
 // AutomationMsg_SetProxyConfig.
 const char kJSONProxyAutoconfig[] = "proxy.autoconfig";
 const char kJSONProxyNoProxy[] = "proxy.no_proxy";
 const char kJSONProxyPacUrl[] = "proxy.pac_url";
 const char kJSONProxyBypassList[] = "proxy.bypass_list";
 const char kJSONProxyServer[] = "proxy.server";
-}
+
+// Named testing interface is used when you want to connect an
+// AutomationProxy to an already-running browser instance.
+const char kNamedInterfacePrefix[] = "NamedTestingInterface:";
+
+}  // namespace automation
+