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This will be supported in @page rules to set the orientation of a page
(without affecting layout). Typically to be used together with named
pages (or @page :first, etc.)

See https://drafts.csswg.org/css-page-3/#page-orientation-prop and
https://github.com/w3c/csswg-drafts/issues/4491

The tests added have some failures, due to crbug.com/1079212 and
crbug.com/1079214

Bug: 1053768
Change-Id: I96f93e3e34beee92b4c30f65d7e46498a8110464
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2187211Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766534}