Merge "Wait for idle after splitting a screen in autofill CTS" am: 49dfdee226 am: 805778293f

Original change: https://android-review.googlesource.com/c/platform/cts/+/1586447

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If9c7ed2f928a2008f915e159e3104cff19482fe6