Revert of Add GM/slide to simulate Android-style reveal clip (patchset #6 id:100001 of https://codereview.chromium.org/2316593003/ )

Reason for revert:
Shader compilation failure

Original issue's description:
> Add GM/slide to simulate Android-style reveal clip
>
> Hopefully, this will let us play w/ geometric and shader-based solutions.
>
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2316593003
>
> Committed: https://skia.googlesource.com/skia/+/ffac5c4aae18fc706e4077763c190a89c8507fb0

TBR=jvanverth@google.com,djsollen@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2316303002
4 files changed