Merge "Use another thread for MediaSessionRecord" into rvc-dev am: 827c121e78 am: 89fc619a53 am: 1f59d2a351

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11986935

Change-Id: Idb9b198e206a364e21f3910eb60bbf232993f80d