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This is the second part, the plumbing on the blink side.

Bug: 876691, 869918
Change-Id: I62fe4aaf37f41b5ebd341ce4731f7fda1d486feb
Reviewed-on: https://chromium-review.googlesource.com/1185015
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585906}