RESTRICT AUTOMERGE Ensure InputMessage is sanitized

Security check for libinput. Send a known message via InputChannel,
where some of the padded bytes have been intentionally modified. Next,
read these back on the consumer channel to ensure that the padding bytes
have been zeroed out.

This was originally submitted at ag/5701187 and pseudo-reverted at
ag/5923383. This commit uploads a fixed verison of the test.

Bug: 115739809
Bug: 120630087
Test: cts-tradefed run cts -m CtsSecurityBulletinHostTestCases -t android.security.cts.Poc19_03
Change-Id: I2e4a37517a8f2ffe50f1134d964359f3a15729e0
Merged-In: I23d6b979c5ff13272626bb0610834fd1147cf645