Merge "Scale down PIP when it's dragged into the dismiss target." into rvc-dev am: 7a1cd3f757 am: bbd804df0a am: f3c5e1e899 am: 5fc81f9566

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11886098

Change-Id: I05f9a71d109743c97ed8dd2bf7ad454280af2445