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The Drallion (Wilco 1.5) keyboard has a slightly different layout than
Wilco 1.0:

1. The toggle mirror mode button has moved from F12 to its own key
without a corresponding F key.
2. F12 now shares a key with privacy screen toggle on devices with a
privacy screen.

BUG=b:147241224
TEST=build and deploy chrome to a Drallion DUT:
autoninja -C out_drallion/Release chrome chrome_sandbox nacl_helper;
deploy_chrome --build-dir=out_drallion/Release --to={DUT_IP};

Verify that top row keys map to expected key codes:
Privacy Screen -> VKEY_PRIVACY_SCREEN_TOGGLE
Privacy Screen + Fn -> VKEY_F12
Privacy Screen + Search -> VKEY_F12
Privacy Screen + Fn + Search -> VKEY_PRIVACY_SCREEN_TOGGLE

Mirror toggle key always maps to VKEY_MEDIA_LAUNCH_APP2 with Control
held down, regardless of Fn and Search key states.

Change-Id: I8df3d28d7ea9445d736ec831b4423f2c224dd592
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008063
Commit-Queue: Mike Wiitala <mwiitala@google.com>
Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734219}