Merge "Add strings for "Show key presses" developer option" into udc-qpr-dev am: 5543e89e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23351558



Change-Id: I867bd200c40e3231647595eca351569434fbd166
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>