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I am preparing to remove this flag in Skia.  Beyond these two debug use
cases, the flag and the performance-only feature it enables appear to
only be used antagonistically by fuzzers.

Bug: skia:7566, chromium:808830
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I99c87f6600200e825aa7a1590d4031030d55af42
Reviewed-on: https://chromium-review.googlesource.com/905107Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534791}