Roll forward to cl/318932159

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: Ia0cddfc8cf46c66d5739bdb45ab7825422912082

cpp/platform_v2/impl/g3/platform.cc

@@ -47,6 +47,11 @@ std::string GetPayloadPath(PayloadId payload_id) {
 }
 }  // namespace
 
+int GetCurrentTid() {
+  const LiveThread* my = Thread_GetMyLiveThread();
+  return LiveThread_Pthread_TID(my);
+}
+
 std::unique_ptr<SubmittableExecutor>
 ImplementationPlatform::CreateSingleThreadExecutor() {
   return absl::make_unique<g3::SingleThreadExecutor>();