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This histogram report the time incognito profile is on screen.

Change-Id: Idef5b1602b941ae98dabad406ca81fd246d7bf8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470573
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819003}