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We close fallback surfaces in order to speed up the arrival of the primary
surface from a child client. That logic was complex and difficult to follow.
Now with SurfaceRanges, that logic can be simplified somewhat.

Bug: 672962
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ied2efb4eac61f297fe6784825084f0a88e716dab
Reviewed-on: https://chromium-review.googlesource.com/1147114
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577381}