Skip mask-with-added-filters.html on Windows GL

This test needs a separate baseline on Windows using real GL.

TBR=kbr@chromium.org

Bug: 1096568
Change-Id: I20e8fbad74a0f1932bcc257137f851392327f724
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254520Reviewed-by: Sean Gilhuly <sgilhuly@chromium.org>
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780355}

third_party/blink/web_tests/FlagExpectations/use-gl=any

@@ -23,6 +23,7 @@ crbug.com/993384 transforms/3d/point-mapping/3d-point-mapping-deep.html [ Skip ]
 # Windows only rebaselines needed.
 crbug.com/993384 [ Win ] compositing/geometry/clipping-foreground.html [ Skip ]
 crbug.com/993384 [ Win ] compositing/iframes/composited-iframe-alignment.html [ Skip ]
+crbug.com/993384 [ Win ] compositing/masks/mask-with-added-filters.html [ Skip ]
 crbug.com/993384 [ Win ] css2.1/t090501-c414-flt-02-d-g.html [ Skip ]
 crbug.com/993384 [ Win ] css2.1/t090501-c414-flt-03-b-g.html [ Skip ]
 crbug.com/993384 [ Win ] css2.1/t100304-c43-rpl-bbx-01-d-g.html [ Skip ]