[infra] Make bot that runs DM on the oldest supported SKP version

There are two SKP versions we deal with here:
* The min and current supported versions in src/core/SkPicturePriv.h.
* The SKP asset version that is incremented weekly in infra/bots/assets/skp/VERSION.

We will need to update the asset version used by the bot when the min version in src/core/SkPicturePriv.h is updated.
Instructions on how to do that have been documented in src/core/SkPicturePriv.h.

As noted in https://bugs.chromium.org/p/skia/issues/detail?id=13278#c2 DM currently does not fail when it fails to parse an SKP. Till DM is updated to fail, developers will have to look for blank images in Gold via this new bot to determine when we are failing to support the oldest SKP version.

Bug: skia:13278
Change-Id: I8fff62cc289c3bd6abf5179bcee349baf0a8188a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/536106
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
6 files changed