Merge "Make Readhead more usable in multithread." am: 69d41f67ac am: 700b090bfa

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1526362

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I30e8d9e75c948ccb0c67f2ccd307da3116f59a4e