GitLab

- picker minimum size is now defined in C++ and sent to javascript in
  loadTimeData
- the picker native window uses this size as minimum size
- in the case of small screens, a smaller native window is still allowed

Change-Id: Ib4750bf09d861336d2c66f76a5fdd8bf2ec7c303
Fixed: 1119893
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367081
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800568}