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This verifies that the JSON which gets produced with the sampled
frames, matches the format that the internal processing pipelines
expect.

R=ssid@chromium.org,etienneb@chromium.org
BUG=1046918

Change-Id: Iaa4e853fe44f8ea16ac81410383413c55cbfbd6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031941
Commit-Queue: oysteine <oysteine@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738675}