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Since we have been unable to join on the VideoDecoderStats table due to
processing times and lack of cross correlation per resolution, metrics
leadership has asked we add this field directly to watch time
calculations.

BUG=1002587
R=chcunningham

Change-Id: Id7ef8a28ec43607920885d62f3597b54aad647cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869681Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708765}