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Currently, Ozone converts evdev scancode to Web Gamepad keycode, and
the keycode is stored in |code| field of GamepadEvent. This CL adds
|raw_code| field to GamepadEvent, which is the original evdev scancode.

This is a part of ARC++ Improved Gamepad Support, which will forward
raw scancode to Android container rather than converting scancode to
keycode in Ozone. For further background, please check the design doc:
go/arc-improved-gamepad

TBR=oshima@chromium.org
TEST=manual
BUG=b:130597086

Change-Id: Id66565631eae9f0e90432b63160b7d82728ec12f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602232
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659419}