Merge "Introduce handwriting hover icon and update its hide/show logic" into udc-dev am: f7e5dac8 am: e42c8b5e am: c1ca16c0 am: 50869609

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



Change-Id: I5d094c51785c337662d94ed87091e0557c83db25
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>