Merge "Lighten bubble scrim" into rvc-dev am: e3f751c4 am: 66ba5f4c am: 0673805e am: 8380ec25

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11924521

Change-Id: I0f6829612681393716c4f51fbc4273f6fdf733a3