[automerger skipped] DO NOT MERGE New back affordance small polish nits am:...

[automerger skipped] DO NOT MERGE New back affordance small polish nits am: 92e8dafe am: cb0fa357 -s ours am: 4f1eea09 -s ours am: 028cd43a -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21483766



Change-Id: I9055e3ac10ab181de535651b65838006911c9f42
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>