healthd: BatteryService dumpstate support

Change-Id: Ia6938b7126751801310632c995af0f96e41f5f64
diff --git a/healthd/healthd.h b/healthd/healthd.h
index fb9504a..23a54bf 100644
--- a/healthd/healthd.h
+++ b/healthd/healthd.h
@@ -72,6 +72,7 @@
 void healthd_battery_update();
 android::status_t healthd_get_property(int id,
     struct android::BatteryProperty *val);
+void healthd_dump_battery_state(int fd);
 
 struct healthd_mode_ops {
     void (*init)(struct healthd_config *config);