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This is the counterpart to crrev.com/1652053004

This adds a simple wrapper around the UMA_HISTOGRAM_* macros
for inclusion in SkUserConfig. Along with the corresponding
Skia change, this allows Skia to log stats which will be
picked up by the UMA system.

BUG=

Review URL: https://codereview.chromium.org/1659303002

Cr-Commit-Position: refs/heads/master@{#373933}