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Move the tests and change them to use the rendersubtree attribute.
Note that the SVG test fails because the rendersubtree attribute is
only defined on HTML elements.

Bug: 991095
Change-Id: I4515d4db3786d7bcd1863e7b5407d88dbbf3c016
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773017Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690899}