Merge "Use a linear interpolator for screen off, since the reveal effects...

Merge "Use a linear interpolator for screen off, since the reveal effects already interpolate the reveal amount internally." into sc-dev am: e2dc0091 am: 78e0d0fc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15131934

Change-Id: I387fee3c546b8e513a59d3bbe9b4f27355f605f5