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Make it possible to enable TransferableStreams from the server side.
This will be useful if we find that we need it before the next branch
point.

Tested manually.

BUG=894838

Change-Id: I93eebe5f36c4a1277492febe1138503c040ac269
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366953Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Auto-Submit: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800160}