make debug mode ~20% faster on linux

base/threading/platform_thread_win.cc

Index: base/threading/platform_thread_win.cc
diff --git a/base/threading/platform_thread_win.cc b/base/threading/platform_thread_win.cc
index a3984d62b5712d644d1277b2ff023494c4778626..80f353a8b46f3a7c8241cb2247ec252037ec2ca8 100644
--- a/base/threading/platform_thread_win.cc
+++ b/base/threading/platform_thread_win.cc
@@ -130,6 +130,11 @@ PlatformThreadId PlatformThread::CurrentId() {
 }
 
 // static
+PlatformThreadRef PlatformThread::CurrentRef() {
+  return PlatformThreadRef(GetCurrentThreadId());
+}
+
+// static
 PlatformThreadHandle PlatformThread::CurrentHandle() {
   NOTIMPLEMENTED(); // See OpenThread()
   return PlatformThreadHandle();