Merge "RTL UI for stack & manage menu user education" into rvc-dev am: 9fba23f9 am: bd604776 am: bbc3aafe

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11887952

Change-Id: I55e55098f445263395d3a84b786a601f9e240d42