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This feature flag alters chromecast's handling of
gestures that originate from the edges of the screne.
When enabled, it is assumed an external side swipe gesture
detector is installed handling touch events downstream.
The touch exploration controller enters pass through
mode when touch events originate from the screen edges.
The side swipe detector is also not installed.

Bug: None
Test: Manual, display assistant
Change-Id: I23d35a322c09933fde3ac6989a90a692fb40e221
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793249Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697236}