Merge "Update input event type to enum class" into udc-dev am: 150c188a am: 1467cd25

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22600156



Change-Id: I5cc948f2c68e0932824fda3d17b11cbf5f1c977d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>