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DrawOcclusion can be enabled with both flags --enable-draw-occlusion and
--enable-features=DrawOcclusion. This cl unifies the two existing flags,
so the it can only be enabled with --enable-features=DrawOcclusion.

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Ib6deef4da8bdbd31fa62380c8bd6de2a97851d12
Reviewed-on: https://chromium-review.googlesource.com/917664Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536770}