Merge "Flush BC_FREE_BUFFER and ref ops from non-looper threads." am: 7677da691e am: 4650445097 am: 6f1178e602

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/541059

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2c3c052d23f6ffa40d024d71b16871db15d1a582