GitLab

Moving automation manifest handler into //extensions. Other
automation bits & pieces to follow in subsequent CLs.

Bug: 822747, b/74537394
Test: Tested install of ChromeVox on ChromiumOs and Google branded Chrome build
Change-Id: I18d828f76c17cb120e7cc9ed8022f107f3f3a2ea
Reviewed-on: https://chromium-review.googlesource.com/964732
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545067}