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This CL is rewriting the ElideText unittests.
The goal of this rewrite is to allow adding more unittests.
  * ELIDE_HEAD
  * ELIDE_EMAIL
  * ELIDE_MIDDLE
  * Eliding with styles

It is now using a templated tests to ease debugging.

A change to the way glyph_width_for_test_ work was needed.
Zero width codepoints will stay zero width, even if a
glyph width is provided. This is required to ensures
RLM and LRM (directional marker) stay with width zero.
Otherwise a DCHECK is failing since the text can be larger
with eliding (2 glyphs instead of 1 glyph).

Bug: 1025561
Change-Id: I19f18fb99f52edbbb59d170f7b47bef3a3f3de5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975056
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726406}