Create a QUIC wrapper around a mutex and a mutex lock.

net/quic/platform/impl/quic_mutex_impl.cc

Index: net/quic/platform/impl/quic_mutex_impl.cc
diff --git a/net/quic/platform/impl/quic_mutex_impl.cc b/net/quic/platform/impl/quic_mutex_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..95e46c1947fa59ac5039c87b3a4f0a5e1ebf8111
--- /dev/null
+++ b/net/quic/platform/impl/quic_mutex_impl.cc
@@ -0,0 +1,25 @@
+// Copyright (c) 2016 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 "net/quic/platform/impl/quic_mutex_impl.h"
+
+namespace net {
+
+void QuicLockImpl::WriterLock() {
+  lock_.Acquire();
+}
+
+void QuicLockImpl::WriterUnlock() {
+  lock_.Release();
+}
+
+void QuicLockImpl::ReaderLock() {
+  lock_.Acquire();
+}
+
+void QuicLockImpl::ReaderUnlock() {
+  lock_.Release();
+}
+
+}  // namespace net