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This CL simply augments FileWStream to support capping the file size.

This work is a precursor to allowing a limit on the total capture size.

Bug: 1071446
Change-Id: I38590bd52e50221f1007d92d673aca74f127158b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2152768Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760090}