Document the need for !IsAtShadowBoundary() in matched styles cache
Some styles (e.g. webkitUserModify) should not propagate from a ShadowRoot to the children. Note [1] that it is possible all such properties are deprecated. But they still have decent [2] usage. See [3] for what happens if this check is removed. [1] https://crbug.com/687462 [2] https://chromestatus.com/metrics/css/timeline/popularity/338 [3] https://ci.chromium.org/p/chromium/builders/try/linux-rel/570174? Fixed: 1158424 Change-Id: I994691cb63d96d60d8a47d8698ad86a43f8ea10e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593285 Auto-Submit: Mason Freed <masonfreed@chromium.org> Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org> Reviewed-by:Anders Hartvoll Ruud <andruud@chromium.org> Cr-Commit-Position: refs/heads/master@{#837469}
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