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Add a feature to control if GpuVsync is enabled or not, in addition to
the --disable-gpu-vsync flag. The feature is on by default so this
should be a no-op change. This is intended to be used in a finch trial
to see what the impact of disabling GPU vsync is after the feature
freeze is over.

Bug: 43611
Change-Id: I09715832b48e5ba9fe11e04404ed68fb441a5dfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597637Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838656}