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This patch changes visual rect of NGPhysicalTextFragment to
include its frame rect. Legacy does so, but NG did not when
it was first implemented due to the lack of understanding.

After reviewing test results, it turns out that by not doing
so, background and decorations on space characters are
affected by this difference because space characters do not
have glyph bounding box, which results in empty visual rect.

Includes rebaselines that improve the rendering.

Bug: 636993, 714962
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_layout_ng;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I888f8b27680aa1ff806cca15c84919461c06fc31
Reviewed-on: https://chromium-review.googlesource.com/1027012Reviewed-by: Aleks Totic <atotic@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553914}