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Add support for using the plane overlay fences provided by the
GbmSurfaceless::ScheduleOverlayPlane() method to synchronize display of
overlays in Ozone-DRM. This also involves implementing the
GbmSurfaceless::SetUsePlaneGpuFences() method to control whether the
provided fences are used instead of the internally constructed
EGLSyncKHR object.

Since the PendingFrame in GbmSurfaceless owns (through GLSurfaceOverlay)
the fences used for that frame, some refactorings where required in the
frame submission code to keep the PendingFrame alive until the frame is
complete.

Bug: 828393
Test: ozone_demo --use-gpu-fences on Ozone-DRM
Change-Id: Id48485c55d7a31b01858ed5dbbf45815ac54c621
Reviewed-on: https://chromium-review.googlesource.com/1021514
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559515}