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ANGLE creates a child window when using X11. The Expose events from this
child window need to be forwarded to Chrome's parent window for the
window to be properly redrawn.

Bug: 991577
Change-Id: Ibba1ad07110953dc46b7bd1939b03471a316f798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822721
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700394}