Add a test to imitate GIFImageDecoderTest.parseAndDecodeByteByByte

With skia_use_wuffs=true, calling getFrameCount after the partial
decode results in the full decode failing.

Bug: skia:8235
Change-Id: I9ac5496e3fecf309f1e303a8d3e8725a6d00731b
Reviewed-on: https://skia-review.googlesource.com/c/176590
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Nigel Tao <nigeltao@google.com>
1 file changed