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diff --git a/gps/utils/LocTimer.h b/gps/utils/LocTimer.h
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+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __LOC_TIMER_CPP_H__
+#define __LOC_TIMER_CPP_H__
+
+#include <stddef.h>
+#include <loc_pla.h>
+
+// opaque class to provide service implementation.
+class LocTimerDelegate;
+class LocSharedLock;
+
+// LocTimer client must extend this class and implementthe callback.
+// start() / stop() methods are to arm / disarm timer.
+class LocTimer
+{
+    LocTimerDelegate* mTimer;
+    LocSharedLock* mLock;
+    // don't really want mLock to be manipulated by clients, yet LocTimer
+    // has to have a reference to the lock so that the delete of LocTimer
+    // and LocTimerDelegate can work together on their share resources.
+    friend class LocTimerDelegate;
+
+public:
+    LocTimer();
+    virtual ~LocTimer();
+
+    // timeOutInMs:  timeout delay in ms
+    // wakeOnExpire: true if to wake up CPU (if sleeping) upon timer
+    //                        expiration and notify the client.
+    //               false if to wait until next time CPU wakes up (if
+    //                        sleeping) and then notify the client.
+    // return:       true on success;
+    //               false on failure, e.g. timer is already running.
+    bool start(uint32_t timeOutInMs, bool wakeOnExpire);
+
+    // return:       true on success;
+    //               false on failure, e.g. timer is not running.
+    bool stop();
+
+    //  LocTimer client Should implement this method.
+    //  This method is used for timeout calling back to client. This method
+    //  should be short enough (eg: send a message to your own thread).
+    virtual void timeOutCallback() = 0;
+};
+
+#endif //__LOC_DELAY_H__