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The histogram records the time between sending a request for scanners
and receiving capabilities for the selected scanner (i.e. the time that
passes before being able to perform a scan).

Bug: 1059779
Change-Id: I8be9453945054848d1b534bf43ba29e2653731da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597656Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841078}