GitLab

This is needed for [1] which adds the assumption that Chrome makes
all requests on the main Xcb connection.  This CL simply moves the
requests to occur on a separate connection to satisfy this assumption.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2565440

R=penghuang

Bug: None
Change-Id: Ia85799c460d0fef372121dae3244874130158fa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566342
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832195}