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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}