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

content/browser/devtools/devtools_http_handler.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <utility>
 
@@ skipping 506 matching lines @@
     return;
   }
 
   if (command == "version") {
     base::DictionaryValue version;
     version.SetString("Protocol-Version",
         DevToolsAgentHost::GetProtocolVersion().c_str());
     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());
 #endif
     SendJson(connection_id, net::HTTP_OK, &version, std::string());
     return;
   }
 
   if (command == "list") {
     DevToolsAgentHost::DiscoverAllHosts(
@@ skipping 160 matching lines @@
   connection_to_client_.erase(connection_id);
 }
 
 DevToolsHttpHandler::DevToolsHttpHandler(
     DevToolsManagerDelegate* delegate,
     std::unique_ptr<DevToolsSocketFactory> socket_factory,
     const std::string& frontend_url,
     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),
       weak_factory_(this) {
   bool bundles_resources = frontend_url_.empty();
   if (frontend_url_.empty())
     frontend_url_ = "/devtools/inspector.html";
 
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
@@ skipping 132 matching lines @@
         id.c_str(),
         host);
     dictionary->SetString(
         kTargetDevtoolsFrontendUrlField, devtools_frontend_url);
   }
 
   return dictionary;
 }
 
 }  // namespace content