Fix build.  Instantiate object before use.

bug:2673562
Change-Id: I1e39f7847c25c5c1923a7b7e864b402c94834528
diff --git a/services/java/com/android/server/ThrottleService.java b/services/java/com/android/server/ThrottleService.java
index c203b4ed..57e3918 100644
--- a/services/java/com/android/server/ThrottleService.java
+++ b/services/java/com/android/server/ThrottleService.java
@@ -128,6 +128,10 @@
         if (DBG) Slog.d(TAG, "Starting ThrottleService");
         mContext = context;
 
+        mPolicyThreshold = new AtomicLong();
+        mPolicyThrottleValue = new AtomicInteger();
+        mThrottleIndex = new AtomicInteger();
+
         mNtpActive = false;
 
         mIface = mContext.getResources().getString(R.string.config_datause_iface);