[DevTools]: Expose V8 version in /json/version

content/public/browser/devtools_agent_host.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_DEVTOOLS_AGENT_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_DEVTOOLS_AGENT_HOST_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 102 matching lines @@
   // If |active_port_output_directory| is non-empty, it is assumed the
   // socket_factory was initialized with an ephemeral port (0). The
   // port selected by the OS will be written to a well-known file in
   // the output directory.
   static void StartRemoteDebuggingServer(
       std::unique_ptr<DevToolsSocketFactory> server_socket_factory,
       const std::string& frontend_url,
       const base::FilePath& active_port_output_directory,
       const base::FilePath& debug_frontend_dir,
       const std::string& product_name,
-      const std::string& user_agent);
+      const std::string& user_agent,
+      const std::string& js_engine_version);
 
   // Stops remote debugging.
   static void StopRemoteDebuggingServer();
 
   // Observer is notified about changes in DevToolsAgentHosts.
   static void AddObserver(DevToolsAgentHostObserver*);
   static void RemoveObserver(DevToolsAgentHostObserver*);
 
   // Attaches |client| to this agent host to start debugging.
   // Returns true iff attach succeeded.
@@ skipping 73 matching lines @@
   static void DetachAllClients();
 
  protected:
   friend class base::RefCounted<DevToolsAgentHost>;
   virtual ~DevToolsAgentHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_AGENT_HOST_H_