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There are some potential breaking changes for the WebXr gamepad module
that may make it so that it cannot be shipped at the same time with the
main WebXr Device API.  Adding this flag enables the flexibility to ship
the WebXr Device API without the optional Gamepad module if breaking
changes are needed to the gamepad module.

Bug: 1013415
Change-Id: I2c79a2a9991a6497197357ecc9f38719b0379a1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854863
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705214}