Merge "Hide hint text when starting handwriting" into udc-dev am: 3d10089d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22688903



Change-Id: I2c0686d4a71f781dc9c2bcdb4e6b8c2c39cdeb96
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>