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Add a minimal test for whether transferable streams are functioning or
not. This can be used to determine whether they have been shipped or
not. The test is in its own directory so that it can be added to the
virtual/stable test suite without any other tests.

This will ensure we don't accidentally ship transferable streams.

BUG=894838

Change-Id: I2de66a55fc1c72ddd742f1d192a152a9264064df
Reviewed-on: https://chromium-review.googlesource.com/c/1356723
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613060}