DL: rendersubtree on SVG works now!

After the move from presentational hints to direct style adjustment,
rendersubtree containment addition & locking works with SVG elements.

Bug: 998030
Change-Id: Ibf10f2614b1562fd58b67fafbf25051b8608d75b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787481Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693752}

third_party/blink/web_tests/TestExpectations

@@ -243,7 +243,6 @@ crbug.com/980969 [ Mac ] http/tests/input/discard-events-to-unstable-iframe.html
 # Display locking failures
 crbug.com/955533 wpt_internal/display-lock/sizing/overflow-auto-with-overflow.html [ Failure ]
 # Skip some tests for rendersubtree
-crbug.com/991095 wpt_internal/display-lock/rendersubtree/paint/locked-svg-doesnt-paint-contents.html [ Skip ]
 crbug.com/991095 wpt_internal/display-lock/rendersubtree/sizing [ Skip ]
 crbug.com/991095 wpt_internal/display-lock/rendersubtree/acquire-clone.html [ Failure ]