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This is a reland of 09cf456a

Failures were due to flakiness in FileManagerTest.OldestFileForCleanup

Timing of last modified time seems to be racy leading to inconsistent
behavior. The fix for this is manually setting the modified time to
something longer.

Original change's description:
> [Paint Preview] Create total size budget
>
> 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}

Bug: 1086963, 1087592
Change-Id: Id95442afcdeb55e60cafc4a8bf6cebef84b3fc8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220483Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773764}