Extend vpnProvider API to support future enhancements

extensions/browser/api/vpn_provider/vpn_provider_api.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_VPN_PROVIDER_VPN_PROVIDER_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_VPN_PROVIDER_VPN_PROVIDER_API_H_
 
 #include <string>
 
 #include "extensions/browser/extension_function.h"
 
 namespace extensions {
 
 class VpnThreadExtensionFunction : public UIThreadExtensionFunction {
  public:
   void SignalCallCompletionSuccess();
+  void SignalCallCompletionSuccessWithId(const std::string& configuration_id);
 
   void SignalCallCompletionFailure(const std::string& error_name,
                                    const std::string& error_message);
 
  protected:
   ~VpnThreadExtensionFunction() override;
 };
 
 class VpnProviderCreateConfigFunction : public VpnThreadExtensionFunction {
  public:
@@ skipping 46 matching lines @@
 
  protected:
   ~VpnProviderNotifyConnectionStateChangedFunction() override;
 
   ExtensionFunction::ResponseAction Run() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_VPN_PROVIDER_VPN_PROVIDER_API_H_