Add method to BatteryStats

Change-Id: Ie05a1ff4ea081bed1777882d3ec6fd84fc5ba98f

src/com/android/settings/fuelgauge/FakeUid.java

@@ -186,6 +186,11 @@ public class FakeUid extends Uid {
         return 0;
     }
 
+    @Override
+    public Timer getProcessStateTimer(int state) {
+        return null;
+    }
+
     @Override
     public Timer getVibratorOnTimer() {
         return null;