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This CL is replacing the previous cache by an MRUCache.

The previous cache was an 'std::map' and was unbounded.
It was not an issue since typically the amount of typeface
loaded is low on the browser side. Unfortunately, that was
not the case when expensive fallback fonts were used and
lot of fonts were installed on the user computer.

The GlyphCache is still an std::map, but it is bounded
to the max amount of glyphs that a font can have (e.g. 16-bits).

Bug: 890298
Change-Id: I1148ea7ebfc285dfcc05e8da454db830e809ebb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874246
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@{#709101}