Add RS watchdog.

Change-Id: I4c912beb84fa8a37ada0088049f7776132e994b6
diff --git a/libs/rs/rsLocklessFifo.h b/libs/rs/rsLocklessFifo.h
index fa53d40..dafc512 100644
--- a/libs/rs/rsLocklessFifo.h
+++ b/libs/rs/rsLocklessFifo.h
@@ -34,6 +34,7 @@
 public:
     bool init(uint32_t size);
     void shutdown();
+    void setTimoutCallback(void (*)(void *), void *, uint64_t timeout);
 
     void printDebugData() const;
 
@@ -71,6 +72,10 @@
 
 private:
     void dumpState(const char *) const;
+
+    void (*mTimeoutCallback)(void *);
+    void * mTimeoutCallbackData;
+    uint64_t mTimeoutWait;
 };