GitLab

New logic:
- Cache screen context on UI launch.
- Start screen context interaction using cached data on chip press.
- Start metalayer (screenshot only) interaction with stylus.

Bug: b:113069944
Change-Id: Iea4089ac2411a8000bc7ebaa16e90e12fcb6a151
Reviewed-on: https://chromium-review.googlesource.com/1186160
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585992}