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8k is big enough for most practical applications and saves some
of OOMs and crashes of underlying codecs.

Bug: 1127633, 1129359
Change-Id: I619a28dd6cb4eefc38f0328ca179e2684e627826
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417511
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808216}