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This change introduces a count histogram for the number of routines a
user runs during one session in the Diagnostics App. The count starts at
zero each time the app is opened, and it is emitted when the app is
closed.


Bug: 1128204
Change-Id: I5dc7eec4f33006a9694c6c694d5a83a06d59a3a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570345
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840326}