Merge "IBinder.transact: clarify return" am: 2794ff0ca8 am: 5e19eaf0e8 am: 83de9444cb

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1990775

Change-Id: Ia92f237101e5e930100a5723651602c7298ac0d9