Merge "Add RESERVE_NEW_UI_EVENT_ID field to EventEnum interface." into sc-v2-dev am: e55c0feb43

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15669032

Change-Id: Ifb94d49a8ca3a82eab474816b0b6c0ca89b84cb1