GitLab

Moves the first run UI flag to SceneState, and updates MainController to
look for any scene showing first run UI.

Bug: 1045660
Change-Id: Ia3cc3b6db9b4899e96c8c7098c336c72ee5c9704
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129538Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755354}