GitLab

Per:

  https://drafts.fxtf.org/filter-effects/#InterfaceSVGFEBlendElement

All other browsers expose these already.

Bug: 906612
Change-Id: I4be6185d4832d980a5d7c6518dcb0b2ccca2ce82
Reviewed-on: https://chromium-review.googlesource.com/c/1341846Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610379}