Bug 1849136 [wpt PR 41509] - Add WPT tests of clip-path on SVG defaulting to use...

Bug 1849136 [wpt PR 41509] - Add WPT tests of clip-path on SVG defaulting to use the stroke-box, a=testonly

Automatic update from web-platform-tests
Add WPT tests of clip-path on SVG defaulting to use the stroke-box

This patch adds two WPT tests covering the following lines from
http://www.w3.org/TR/css-masking-1/#the-clip-path:
1. If no reference box is specified, the border-box will be used as
  reference box.
2. For SVG elements without an associated CSS layout box, the used
  value for ... border-box and margin-box is stroke-box.

Bug: 694218
Change-Id: I93e589b371ccb92c5a7392c97d234d921fc5ead6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4789882
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Auto-Submit: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1184669}

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wpt-commits: f559b5121d6b0d1ac0b547a8fddf13b8031957c7
wpt-pr: 41509