Merge "Added WriterFuzzerBase class" am: 4c51bbb34c am: 4892544ea5

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1533162

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4836b0b88014f2546078a783d06f4dc51116cd24