Merge "Introduce handwriting hover icon and update its hide/show logic" into udc-dev am: f7e5dac8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22913454



Change-Id: I4dd6411b00847d23465ed5d8c17d800c9d525cb2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>