offsetTop/offsetLeft of inline elements

- Fix offsetTopLeftInline.html for legacy (because I need the test
  coverage when working on visual rects).
- Add a test for offsetTop/offsetLeft of empty inline elements.
  The test fails in LayoutNG.

Bug: 953479
Change-Id: I31eceb4f22540c49db037f685867c95a33e0390d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570749
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651520}
4 files changed