base: Enable lock dchecks with dchecks_always_on

base/synchronization/lock.cc

 // Copyright (c) 2011 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.
 
 // This file is used for debugging assertion support.  The Lock class
 // is functionally a wrapper around the LockImpl class, so the only
 // real intelligence in the class is in the debugging logic.
 
-#if !defined(NDEBUG)
+#if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
 
 #include "base/synchronization/lock.h"
 #include "base/logging.h"
 
 namespace base {
 
 Lock::Lock() : lock_() {
 }
 
 Lock::~Lock() {
   DCHECK(owning_thread_ref_.is_null());
 }
 
 void Lock::AssertAcquired() const {
   DCHECK(owning_thread_ref_ == PlatformThread::CurrentRef());
 }
 
 void Lock::CheckHeldAndUnmark() {
   DCHECK(owning_thread_ref_ == PlatformThread::CurrentRef());
   owning_thread_ref_ = PlatformThreadRef();
 }
 
 void Lock::CheckUnheldAndMark() {
   DCHECK(owning_thread_ref_.is_null());
   owning_thread_ref_ = PlatformThread::CurrentRef();
 }
 
 }  // namespace base
 
-#endif  // NDEBUG
+#endif  // !NDEBUG || DCHECK_ALWAYS_ON