Merge "[17/n] Letterbox Education: change the ripple color of the dismiss button." into tm-dev am: 81e37769 am: 637385de

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17107548

Change-Id: I31d3536b7bc4356689bcaa78ac20337108b3cc1e