GitLab

There is a mistake in ReportHistogram such that Universal and Video
isn't reporting any UMA. This CL fixes it and added unit tests.

Bug: None
Change-Id: Iedcfd26d17d5db92cc98d91588abd1e0a38c544f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055877
Auto-Submit: Xida Chen <xidachen@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741348}