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This CL enables media machine learning's smoothness experiment, to
collect accuracy information.  It does not affect MediaCapabilities
predictions; the goal is to see if the ML predictions are good
enough to switch MediaCapabilities over to it.

Change-Id: I066751abde8034f0f67b5a6ea17fe7da86f39892
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020565
Auto-Submit: Frank Liberato <liberato@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735219}