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Add screen recordings video files type to holding space.

Screen recordings are video captures of the contents of the user
display. These files will be added in to the screen captures area of the
holding space tray and will be treated in the same way as screenshots.

Bug: 1144927
Change-Id: I0f47d1670b1bcd0e43d514325962ef3669a84901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518411Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825529}