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

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

Change-Id: Idbee9d11bab57c2e4f3e3d82b61b187617b0937b