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These metrics measure how our algorithm for opening video devices on Mac
work with devices in the wild by seeing what happens on the first frame
after opening the camera. We compare what we asked the webcam to do with
what we actually get. We also will see how often we receive IOSurfaces
in the Mac capture pipeline.

correct values for histograms.

Bug: 1156144
Test: Ran locally with appr.tc with 2 different cameras to confirm
Change-Id: I58eb1414d9def98cf4cf2b90e15c69d29bdc0148
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621817Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Markus Handell <handellm@google.com>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844075}