sideways: Basic support for SVG
Text in the sideways-lr writing mode should grow upward from "current
text position". This CL supports x y dx dy and text-anchor
for the sideways-lr writing mode.
textLength and <textPath> will be supported later.
Bug: 40501131
Change-Id: If67215f59b9b623a92a06cbc56457a323362255e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5963882
Auto-Submit: Kent Tamura tkent@chromium.org
Reviewed-by: Koji Ishii kojii@chromium.org
Commit-Queue: Koji Ishii kojii@chromium.org
Cr-Commit-Position: refs/heads/main@{#1374467}