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This is a simple change to allow VP9 to work reasonably well without
crashing, when connecting via the website with VP9 experiment enabled.

Future work will optimize VP9 encoding, and remove large-picture
detection in the frame scheduler (as it's not needed for VP9).

Change-Id: Id80297dd9a0abf420ccf0e22251fca23200c32e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1489711Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637936}