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This change consolidates the cache building code in the base class:
FontEnumerationCache. Aside from being the right thing to do, this will
allow for easier finalization features e.g. the sorting of fonts before
caching, and any finalization step.

Bug: 1043306
Change-Id: Ie43885a376e3412157799c0e1c2dbcf7576c45f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422456Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809597}