Revert "Add mskp player, use in viewer slide"

This reverts commit 9230fc59b75065fbd88d98cc3070cd2e3cd5c274.

Reason for revert: broke something in housekeeping docker build.

Original change's description:
> Add mskp player, use in viewer slide
>
> viewer now takes --mskps <dir> and will have a slide per mskp and
> overview slide (just like --skps).
>
> Player uses offscreen surfaces to draw offscreen layers, allows
> random access to mskp frames.
>
> slide just plays mskp at fixed frame rate (for now).
>
> Bug: skia:11900
> Change-Id: I66104ffe88f5df721a1a835570acc3e4c23c3f07
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/400537
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Jim Van Verth <jvanverth@google.com>

TBR=jvanverth@google.com,bsalomon@google.com,nifong@google.com

Change-Id: I97fb7a64d5ef2ca14dba1cf9e2ba91ab0e9d0018
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:11900
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/402639
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
7 files changed