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This is a reland of 56eadad0
Original change's description:
> gpu scheduler: Compute stream priorities based on priority of waiters.
> 
> Previously, a stream tracked all of it's fences that had waiting streams
> in 'release_fences'.  If 'release_fences' was non-empty, the stream's
> priority got bumped up to High.  This means a stream with Normal priority
> waiting on Low priority stream could bump that stream up to High priority.
> 
> This change removes that tracking, and instead keeps count of the number
> of waiting streams at each StreamPriority.  The highest priority with non-
> zero count becomes the stream's priority.
> 
> When a stream changes priority, it recursively propagates it's new priority
> to all streams it's waiting on.
> 
> BUG=781585
> 
> Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: I1fc96f6ca065a8e1f83ddaa61ae4f9725c324bcb
> Reviewed-on: https://chromium-review.googlesource.com/754415
> Commit-Queue: Victor Miura <vmiura@chromium.org>
> Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#515097}

Bug: 781585
Change-Id: I67055fe2887a8ffcc8032af32ab221a3d66bedac
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/762145
Commit-Queue: Victor Miura <vmiura@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517702}