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Some client resources (video, etc) will need to wait on a ResourceFence
before returning them to client. That fence is released when all GPU
work for the root render pass are finished on GPU. However, on macOS,
there isn't a root render pass for every frames, and all related client
resources will never be released. To fix the problem, we have to release
the fence for each GPU tasks (drawing non root render passes, drawing
render pass overlays, etc).

Bug: 1143042
Change-Id: I335e4a7c4a36557315cede7edd834b028c7b015d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537112Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827445}