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This CL adds metrics for counting the number of consecutive screenshots
a user takes. Visit go/capture-mode-metrics to see other planned
metrics.

Test: manual + added
Bug: 1140182
Change-Id: Ic1b39e3601fd890ad42b9d9e18678b60793cd7cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532997
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827364}