Merge "Update Back arrow colors" into udc-dev am: 60321d82

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23500449



Change-Id: I985511485556f8920fca2f68e8922eb1a284c260
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>