healthd: Add hooks for ENERGY_COUNTER property

Bug: 10118565
Change-Id: Ibabae2a78a600ae37ce9b91da0f5980ee94b05c2
diff --git a/healthd/healthd.h b/healthd/healthd.h
index 23a54bf..972e728 100644
--- a/healthd/healthd.h
+++ b/healthd/healthd.h
@@ -18,6 +18,7 @@
 #define _HEALTHD_H_
 
 #include <batteryservice/BatteryService.h>
+#include <sys/types.h>
 #include <utils/Errors.h>
 #include <utils/String8.h>
 
@@ -64,6 +65,8 @@
     android::String8 batteryCurrentNowPath;
     android::String8 batteryCurrentAvgPath;
     android::String8 batteryChargeCounterPath;
+
+    int (*energyCounter)(int64_t *);
 };
 
 // Global helper functions