Add fuzzers for SkAndroidCodec & incrementalDecode

Fuzz SkAndroidCodec to help to catch errors in both incrementalDecode
and scanlineDecode. Try a variety of sample sizes, but cap it at 64.
Though sometimes larger sample sizes are used, the lower ones tend to
more common. Also draw the resulting bitmap to verify that we
initialized all pixels.

Independently test incrementalDecode to ensure that it initializes
rowsDecoded.

Change-Id: I20d8a408cd280262fdc62f902a6f04f0f57f5ad2
Reviewed-on: https://skia-review.googlesource.com/c/162025
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
3 files changed