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This change adds the Open Screen Protocol library to DEPS so that our
team can begin working on Chromium integration and testing ahead of its
completion.

Change-Id: I52ebca0b3eb890b4be2529b4cbb99a944e5133eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1480703Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638280}