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This CL modifies exo to send raw gamepad scancode to ARC when
ExoRawGamepadInfo is enabled. ARC can identify if it's raw scancode
by whether the gamepad was initialized by gamepad_added or
gamepad_added_with_device_info.

Previously, Exo was sending Web Gamepad keycode to ARC, but this will be
deprecated as a part of the effort to improve ARC Gampad compatibility.
Design doc: go/arc-improved-gamepad

TEST=manual(--enable-features=ExoRawGamepadInfo to /etc/chrome_dev.conf)
BUG=b:130597086

Change-Id: Ied4da69655623a243b9e1caa681212138d46918e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612857Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661276}