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The layout test was introduced to verify the ability to select
text on certain elements (*). Incidentally, it hit tests the 1px
gap between two lines on Linux, which results in different behaviors
between legacy and NG due to different line box sizing.

This patch explicitly sets font metrics and line-height to stablize
its behavior.

(*) crrev.com/20a8d9a8

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I44918bf049607110572fc479548f3c958770c8ba
Reviewed-on: https://chromium-review.googlesource.com/1152216
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578546}