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According to Intel, the overlay support caps might change after a
monitor connection change. This CL re-queries the overlay caps when this
event is observed.

Refactor UpdateHardwareOverlaySupport().

Bug: 1042989
Change-Id: I84ef4ff3dca098f3778f8188fdd7157349480144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019768Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735262}