Explicitly pass Thread::Current to MutexLock and Alloc.

Change-Id: I8b75bc0617915465f102815b32306aa7760dcae4
diff --git a/src/logging.cc b/src/logging.cc
index 48785c5..5680ed0 100644
--- a/src/logging.cc
+++ b/src/logging.cc
@@ -105,7 +105,7 @@
 
   // Do the actual logging with the lock held.
   {
-    MutexLock mu(*Locks::logging_lock_);
+    MutexLock mu(Thread::Current(), *Locks::logging_lock_);
     if (msg.find('\n') == std::string::npos) {
       LogLine(msg.c_str());
     } else {