GitLab

Previously android app was using key code when sending keyboard events.
That approach doesn't work well with physical keyboard when using
layout other than QWERTY. Fixed the client to use scan codes, so that
the events are always send correctly and layout mapping is applied
only on the client.

BUG=475713

Review URL: https://codereview.chromium.org/1321223003

Cr-Commit-Position: refs/heads/master@{#347874}