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The IOSurfaceCapturer for MacOSX has great experiment results on all
channels. So move on to next step to enable it by default on TOT before
enabling it 100% everywhere.

Bug: 840597
Change-Id: I99f0dd64c3ce280173f89cb73012bbd3077f54a2
Reviewed-on: https://chromium-review.googlesource.com/1181921Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Weiyong Yao <braveyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584632}