[LayoutNG] Add float aware intrinsics for inline.

This makes the min/max content calculation for inlines float aware.
This is reasonably similar to the existing intrinsics calculation today, which is
different to how we calculate it for blocks.

Bug: 635619
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Ie0962143a083281b49c8290788fabfce9cae0b6c
Reviewed-on: https://chromium-review.googlesource.com/809942
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522606}
6 files changed