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

content/browser/devtools/devtools_http_handler.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_BROWSER_DEVTOOLS_DEVTOOLS_HTTP_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_HTTP_HANDLER_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 42 matching lines @@
   // 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.
   DevToolsHttpHandler(
       DevToolsManagerDelegate* delegate,
       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);
   ~DevToolsHttpHandler();
 
  private:
   friend class ServerWrapper;
   friend void ServerStartedOnUI(
       base::WeakPtr<DevToolsHttpHandler> handler,
       base::Thread* thread,
       ServerWrapper* server_wrapper,
       DevToolsSocketFactory* socket_factory,
       std::unique_ptr<net::IPEndPoint> ip_address);
@@ skipping 37 matching lines @@
 
   std::unique_ptr<base::DictionaryValue> SerializeDescriptor(
       scoped_refptr<DevToolsAgentHost> agent_host,
       const std::string& host);
 
   // The thread used by the devtools handler to run server socket.
   base::Thread* thread_;
   std::string frontend_url_;
   std::string product_name_;
   std::string user_agent_;
+  std::string js_engine_version_;
   ServerWrapper* server_wrapper_;
   std::unique_ptr<net::IPEndPoint> server_ip_address_;
   using ConnectionToClientMap =
       std::map<int, std::unique_ptr<DevToolsAgentHostClientImpl>>;
   ConnectionToClientMap connection_to_client_;
   DevToolsManagerDelegate* delegate_;
   DevToolsSocketFactory* socket_factory_;
   using DescriptorMap =
       std::map<std::string, scoped_refptr<DevToolsAgentHost>>;
   DescriptorMap agent_host_map_;
   base::WeakPtrFactory<DevToolsHttpHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsHttpHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_HTTP_HANDLER_H_