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This CL tracks the number of times a video capture device is accessed
simultaneously to understand if Chrome should add some restrictions
around simultaneous camera access.

Test: Go to chrome://histrograms/Media.VideoCapture.NumberOfClients
and access camera device from several tabs.

Change-Id: I1a4bb4020ff13bd1ddc54a59094379115e2f65e5
Bug: 1134077
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440514
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814600}