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After [1], Chrome and ANGLE use separate X11 connections, so in order
for Chrome to receive exposure events, it must select for them its own
connection.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2492177

Change-Id: If01cd9d106bf900a5c7a56768602b34dc50b1a23
Bug: 1158170
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602441
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839168}