+// The negative value for background effect and background has been
+// chosen so that newer controls can have content without setting
+// depth index, and go in front of native controls with a background.
+// This backround negative value means that the highest possible value
+// is SIBLING_ORDER_MULTIPLIER-BACKGROUND_EFFECT-1. The divisor of
+// 100 ensures the range fits within the sibling order range, and has
+// enough gaps to allow Control Authors to use other intermediate depths.