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Currently only being used on FontCache, to be used on other Font-related
classes.

Bug: 730692
Change-Id: I58f66d6cf59dca83be5133fc273136ce408e5b2e
Reviewed-on: https://chromium-review.googlesource.com/531753
Commit-Queue: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478802}