Merge "libbinder: setupPolling flushes commands" am: b86f892039 am: c8e80ed794

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1552567

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I9cd924a82a8240b57e1704888bd97af68852e2f7