Merge "Add RESERVE_NEW_UI_EVENT_ID field to EventEnum interface." into sc-v2-dev am: e55c0feb43 am: 950e1be83f

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

Change-Id: Ie59b0db6ba150654b93506b9a6df2a67e5932b0b