GitLab

  * Convert gRPC keyboard events to ui::KeyEvents and dispatch
  * Add support for creating synthetic keyboard events to the
    test client.

(Note: Due to issues with webview focus I haven't been able to confirm
that  the events dispatch correctly, but the logic mirrors other input
events.)

Bug: internal b/161811385
Test: manual
Change-Id: I75f8b237cbde4f28c69f1a4d7257c4e8fe06d34d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416570Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807920}