Merge "libutils: sharedbuffer test - expect greatness!" am: 9dd80b6b04 am: 246739cc61 am: 161d760f31

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1688812

Change-Id: Id6ec8ae3f744c1936faebdd66bb2f32b2e6cf814