Merge "Fix flicker when create split from taskbar" into tm-qpr-dev am:...

Merge "Fix flicker when create split from taskbar" into tm-qpr-dev am: 417cc2db am: ad9f2eab am: 19aac235 am: 8808fa8b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22149375



Change-Id: Idb4754cbe65556e759a80ce789ea360668a8b83e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>