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GPU compositing is never specifically blacklisted in
software_rendering_list.json, only when all are disabled, so remove it,
and add GPU_FEATURE_TYPE_GL. Use this as a proxy for GPU compositing for
now. This will need to be fixed to support the case where GL is
blacklisted, but Vulkan is still enabled.

Bug: 1005383
Change-Id: I0330021cfa59c6c4cf2719785f7931e53ec50f80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917753
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719399}