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This is a reland of b40da6df

TBR=asvitkine@chromium.org

Original change's description:
> Lift fallback font unittests to share them across platforms
>
> This CL is lifting the parameterized unittests originally
> wrote for windows to a common file to be available to
> other platforms.
>
> Test from KnownExpectedFonts will now also run on Linux.
>   * Added the test cases for linux.
> Test from Glyphs are now running on every platforms.
>
> Adding a matching_glyphs count to font_fallback_linux.cc.
> Previously, a default font was returned for a single character
> even if it was not matching the character, it was still the
> best match. If no codepoints are found, the font is considered
> a no match.
>
> Change-Id: Ie4f871281737e254bbdbea9e04f8e527f1049569
> Fixed: 3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879956
> Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Reviewed-by: Robert Liao <robliao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#710364}

Change-Id: Ie05d48f95834913b859d46e452965df00351649c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888185Reviewed-by: Etienne Bergeron <etienneb@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710766}