Added callback for Face Unlock service to poke the wakelock

Change-Id: I76a4e0f8ac0fe17e39195f4593fac7e36d7281f0

Author: Brian Colonna

core/java/com/android/internal/policy/IFaceLockCallback.aidl

@@ -21,4 +21,5 @@ import android.os.IBinder;
 oneway interface IFaceLockCallback {
     void unlock();
     void cancel();
+    void pokeWakelock();
 }

policy/src/com/android/internal/policy/impl/LockPatternKeyguardView.java

@@ -1170,5 +1170,12 @@ public void cancel() {
             mHandler.sendEmptyMessage(MSG_HIDE_FACELOCK_AREA_VIEW); // Expose fallback
             stopFaceLock();
         }
+
+        // Allows the Face Unlock service to poke the wake lock to keep the lockscreen alive
+        @Override
+        public void pokeWakelock() {
+            if (DEBUG) Log.d(TAG, "FaceLock pokeWakelock()");
+            mKeyguardScreenCallback.pokeWakelock();
+        }
     };
 }