Update mojo sdk to rev c02a28868825edfa57ab77947b8cb15e741c5598

third_party/mojo/src/mojo/edk/system/mutex.cc

Index: third_party/mojo/src/mojo/edk/system/mutex.cc
diff --git a/third_party/mojo/src/mojo/edk/system/mutex.cc b/third_party/mojo/src/mojo/edk/system/mutex.cc
new file mode 100644
index 0000000000000000000000000000000000000000..216b35a0388446f0ae910ac0e068af8ae0720616
--- /dev/null
+++ b/third_party/mojo/src/mojo/edk/system/mutex.cc
@@ -0,0 +1,38 @@
+// Copyright 2014 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.
+
+#include "mojo/edk/system/mutex.h"
+
+#if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
+
+#include "base/logging.h"
+
+namespace mojo {
+namespace system {
+
+Mutex::Mutex() : lock_() {
+}
+
+Mutex::~Mutex() {
+  DCHECK(owning_thread_ref_.is_null());
+}
+
+void Mutex::AssertHeld() const {
+  DCHECK(owning_thread_ref_ == base::PlatformThread::CurrentRef());
+}
+
+void Mutex::CheckHeldAndUnmark() {
+  DCHECK(owning_thread_ref_ == base::PlatformThread::CurrentRef());
+  owning_thread_ref_ = base::PlatformThreadRef();
+}
+
+void Mutex::CheckUnheldAndMark() {
+  DCHECK(owning_thread_ref_.is_null());
+  owning_thread_ref_ = base::PlatformThread::CurrentRef();
+}
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // !NDEBUG || DCHECK_ALWAYS_ON