GitLab

Creates DefaultBrowserPromoCoordinator, which will manage
new DefaultBrowserPromoViewController to show the fullscreen
promotion modal for users that may want to set Chromium as
their default browser.

Screenshot: https://drive.google.com/file/d/1wGlAB88CA-vokoBnolz59a4lvaFrKXfc/view?usp=sharing

Bug: 1107489
Change-Id: Ia937bdbdb5bb275435dfe234a2019455b1ffdff9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318687Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792372}