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Currently GestureNav/horizontal overscroll is enabled on all Aura builds. However to engage GestureNav you either need a touch screen or a 2-finger gesture support for the touchpad. This means we are paying the cost of screenshotting for every navigation on some machines where you won't ever be able to experience GestureNav.

BUG=398516

Review URL: https://codereview.chromium.org/617543002

Cr-Commit-Position: refs/heads/master@{#297771}