The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/995425d1170e9a8ebbdceafbc60961bcf5e99a54

commit 995425d1170e9a8ebbdceafbc60961bcf5e99a54
Author: akaba <akaba@google.com>
Date: Thu Aug 02 20:48:08 2018

SurfaceManager::GetLatestInFlightSurface should be able to return the primary

GetLatestInFlightSurface should return the primary if it exists and active.
There is no reason for it not to do so and this will make working with
it easier.

Bug:  869507 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Icae9da8527de69555e8c925740c08b187f827b02
Reviewed-on: https://chromium-review.googlesource.com/1157140
Commit-Queue: Andre Kaba <akaba@google.com>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580311}
[modify] https://crrev.com/995425d1170e9a8ebbdceafbc60961bcf5e99a54/components/viz/service/display/surface_aggregator.cc
[modify] https://crrev.com/995425d1170e9a8ebbdceafbc60961bcf5e99a54/components/viz/service/frame_sinks/surface_synchronization_unittest.cc
[modify] https://crrev.com/995425d1170e9a8ebbdceafbc60961bcf5e99a54/components/viz/service/surfaces/surface.cc
[modify] https://crrev.com/995425d1170e9a8ebbdceafbc60961bcf5e99a54/components/viz/service/surfaces/surface_manager.cc