add a new set of commands to resize and position windows

chrome/browser/devtools/devtools_protocol.h

 // Copyright (c) 2013 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_DEVTOOLS_DEVTOOLS_PROTOCOL_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_PROTOCOL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 23 matching lines @@
       std::unique_ptr<base::DictionaryValue> params);
 
   static std::unique_ptr<base::DictionaryValue> CreateSuccessResponse(
       int command_id,
       std::unique_ptr<base::DictionaryValue> result);
 
   static std::unique_ptr<base::DictionaryValue> CreateInvalidParamsResponse(
       int command_id,
       const std::string& param);
 
+  static std::unique_ptr<base::DictionaryValue> CreateErrorResponse(
+      int command_id,
+      const std::string& error_message);
+
  private:
   DevToolsProtocol() {}
   ~DevToolsProtocol() {}
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_PROTOCOL_H_