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This flag is not used for other platforms except MAC so wrapping it in
the Chromium code search has a bug where references for Mac are not
indexed (128985) so it is confusing that code search doesn't show the
four references to this flag inside the #if defined (OS_APPLE) in
gl_renderer.cc.

Bug: n/a
Change-Id: Ife127ec0297e7fccb41e6be68665cde29210b0cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488722Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Auto-Submit: Jun Liu <yjliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819961}