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

chrome/browser/android/devtools_server.cc

Index: chrome/browser/android/devtools_server.cc
diff --git a/chrome/browser/android/devtools_server.cc b/chrome/browser/android/devtools_server.cc
index 56c47367c7cf3280a8f85160a4f9d10ae8996672..f5450e52b175e0bf4c3fa4c0fa9165170c89fb92 100644
--- a/chrome/browser/android/devtools_server.cc
+++ b/chrome/browser/android/devtools_server.cc
@@ -44,6 +44,7 @@
 #include "net/base/net_errors.h"
 #include "net/socket/unix_domain_server_socket_posix.h"
 #include "net/url_request/url_request_context_getter.h"
+#include "v8/include/v8.h"
 
 using base::android::JavaParamRef;
 using content::DevToolsAgentHost;
@@ -160,7 +161,8 @@ void DevToolsServer::Start(bool allow_debug_permission) {
       std::move(factory),
       base::StringPrintf(kFrontEndURL, content::GetWebKitRevision().c_str()),
       base::FilePath(), base::FilePath(),
-      version_info::GetProductNameAndVersionForUserAgent(), ::GetUserAgent());
+      version_info::GetProductNameAndVersionForUserAgent(), ::GetUserAgent().
+      v8::V8::GetVersion());
   is_started_ = true;
 }