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

content/browser/devtools/devtools_http_handler.cc

Index: content/browser/devtools/devtools_http_handler.cc
diff --git a/content/browser/devtools/devtools_http_handler.cc b/content/browser/devtools/devtools_http_handler.cc
index 98841ec8cec7ab59e58aec0d2f723fe106b7bea6..61a1794e03219aea019be421f399e93d97747f06 100644
--- a/content/browser/devtools/devtools_http_handler.cc
+++ b/content/browser/devtools/devtools_http_handler.cc
@@ -524,6 +524,7 @@ void DevToolsHttpHandler::OnJsonRequest(
     version.SetString("WebKit-Version", GetWebKitVersion());
     version.SetString("Browser", product_name_);
     version.SetString("User-Agent", user_agent_);
+    version.SetString("V8-Version", v8_version_);
 #if defined(OS_ANDROID)
     version.SetString("Android-Package",
         base::android::BuildInfo::GetInstance()->package_name());
@@ -704,11 +705,13 @@ DevToolsHttpHandler::DevToolsHttpHandler(
     const base::FilePath& 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& v8_version)
     : thread_(nullptr),
       frontend_url_(frontend_url),
       product_name_(product_name),
       user_agent_(user_agent),
+      v8_version_(v8_version),
       server_wrapper_(nullptr),
       delegate_(delegate),
       socket_factory_(nullptr),