Implement lock contention event logging.

Change-Id: I88b30985590157bb5d04229a97f191b898f141bb
diff --git a/src/monitor_linux.cc b/src/monitor_linux.cc
new file mode 100644
index 0000000..856ebe4
--- /dev/null
+++ b/src/monitor_linux.cc
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "monitor.h"
+
+namespace art {
+
+void Monitor::LogContentionEvent(Thread*, uint32_t, uint32_t, const char*, uint32_t) {
+}
+
+}  // namespace art