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These histrograms are still needed, because these metrics are important
to measure video performance of WebRTC. They may not be actively used
right now but this is because we currently don't run any relevant
experiments. It's won't be the case in the future.

Bug: 970011,969980
Change-Id: Ib119ae50b6d1b4a2494121fed8226a38a1c44cf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645214Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Auto-Submit: Ilya Nikolaevskiy <ilnik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667314}