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We're working toward the goal of always using double buffering
in CrOS.
This flag is useful to test Chrome with only double buffer.

Bug: None
Test: None
Change-Id: I86e3be97ee91a62742ca07c8a93a68b4c3db7cd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370426
Auto-Submit: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800853}