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This CL introduces a mechanism to determine the oldest files and
enforce a total disk size budget for captures. By default this is set to
25 MB for the tab service. This will ensure we don't use excessive disk
space.

Bug: 1086963
Change-Id: I71bd8efa5985214b322a4dc3048afbe4d0b717f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218548
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772809}