Merge "Use testapi to trigger gc in system and sysui" into sc-dev am: d193f65878 am: 47f8f9e73b am: 8a82087dd1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14463337

Change-Id: I86861b42512962d3a15f526053369da155133aef