Seeing a few bytes of the buffers might help to get an understanding
of what goes wrong when blob check sums don't match.

Bug: None
Change-Id: I482af2b3d885afca39057d0841923449ec65d611
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2900218
Commit-Queue: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>