Merge "Added WriterFuzzerBase class" am: 4c51bbb34c am: 4892544ea5 am: 5fcb0cfbc3

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6b08f083f300bbf10f913a09bac6d008534a4944