Bring back the shadow strength tweak

bug:16712006

Change-Id: Ifc0ecca139d58140b45d7d227536a53069e1d480
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index e00cb0b..0482430 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -366,6 +366,9 @@
     float propertyLightPosY;
     float propertyLightPosZ;
     float propertyAmbientRatio;
+    int propertyAmbientShadowStrength;
+    int propertySpotShadowStrength;
+
 private:
     enum OverdrawColorSet {
         kColorSet_Default = 0,