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Per Xcode release notes, setting FramebufferServerRendererPolicy to 'none'
will allow CoreSimulator to skip compositing operations in the virtual
frame buffer.  This may improve test performance.

To avoid any unexpected complications, first delete this value before and
after each test run.  In a followup CL, this value can be set to 'none'
without potentially breaking other bots.

Bug: 989674
Change-Id: I90319a86364ee727bc751cb27ac9404f989deb69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854266Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Maksym Onufriienko <monufriienko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705254}