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This patch switches the custom "add overlay" methods for a single
unified "addSceneOverlay". This new method does insertion sort based
on a predefined list determining the order of each overlay. Display
order is no longer based exclusively on the order in which the
overlays were added. If two overlays of the same type are added, the
most recently added overlay will display above the others.

Bug: 1070281, 1131536
Change-Id: I5764593debb13d30389f78303120ec4b4fcbb28f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392403
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811784}