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

content/browser/devtools/devtools_http_handler.h

Index: content/browser/devtools/devtools_http_handler.h
diff --git a/content/browser/devtools/devtools_http_handler.h b/content/browser/devtools/devtools_http_handler.h
index 207b2a90e1208f48937f11a1dc6a0fb982ea0404..b79407dc7cb81be04751a3de69c4454c5247aa78 100644
--- a/content/browser/devtools/devtools_http_handler.h
+++ b/content/browser/devtools/devtools_http_handler.h
@@ -60,7 +60,8 @@ class DevToolsHttpHandler {
       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:
@@ -118,6 +119,7 @@ class DevToolsHttpHandler {
   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 =