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Allows for subframe recordings to be saved to either the disk or memory buffers.

Change-Id: I0630babd421716ed9bf354e22a3b8eca8ce46932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274166Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791529}