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

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

Change-Id: I76009f5310debb06f9e88ef1cf0e7d6f36d72c64