Merge "Allow workspace to provide icon positions in tests" into tm-dev am: 21ea6828d8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17757983

Change-Id: I500fd09cdd57cd6f804d25bedf5283ff32d689b2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>