Merge "Only allow RecordDVR to flush buffer when the DVR is stopped" am: 30e3efaaa5 am: 6c28ea88e5

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1554520

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I84ee8ce707bb48ec12bb453200eaeec1c5244ed4