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We want to update histograms with tokens first before updating
histograms with suffixes. As we're migrating to the new patterned
histgorams, some based histograms will be generated from variants so
_UpdateHistogramsWithTokens function need to be aware of that.

Bug: 758782
Change-Id: I94910b384d8880b9ed314a8b70dbe831c58a9de6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464431Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816844}