Merge "Rotate back button drawable when IME present." into tm-qpr-dev am: 71a7a13f06 am: 36c1d35a5b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21136523

Change-Id: Ide328db3ebcc31cbe5e7c598e0356435f13f7474
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>