rm gm/skvm.cpp

It's not that useful now that we're drawing real stuff,
and kind of annoying to keep updating its Fade shader.

Change-Id: Ie8252b9a189bd38b150647e4a93b66b765c7ef97
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262536
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2 files changed