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A new feature switch DirectCompositionUseOverlayDamageList is added to
enable the new method that removes the overlay damage from the
root damage to get the final optimized damage rect.

This CL also adds a new histogram
GPU.DirectComposition.DCLayer.OverlayCount which records the total
number of overlays we are going to present in the DC overlay processor.

Bug:1117235

Change-Id: I1fb97d8b4fd96270ff6447b63ad86785d60c2eeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416966
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813071}