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This fixes floats-do-not-fit-on-line.html which was two bugs combined.

1) List-markers shouldn't be positioned next to empty line boxes
   (unless point 2 occurs). This occurs in particular with floats,
   the list marker should follow the text down (which was the
   primary bug here).

2) List-markers should only be positioned next to empty line boxes if
   we are at the "last" line. I believe this includes forced \n breaks.
   We should produce a line box in these circumstances.

This patch also cleans up the "is empty line" logic inside:
NGInlineLayoutAlgorithm. Which was previously inconsistent :).

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I9bdc76a5cc40bf8c15651916594c44fd2383097c
Bug: 636993
Reviewed-on: https://chromium-review.googlesource.com/1136799Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575425}