GitLab

-Fixed ExtensionApps::Connect to check the app disable reason before
publishing instead of publishing as always disabled by user.
-Fixed ExtensionApps::OnSystemWebAppsInstalled to check the app status
before publishing instead of always publishing as ready.
-Added ExtensionApps::OnExtensionStateChanged to publish the app in case
it got disabled by a policy.

Bug: 1063404
Change-Id: Ia09d4dee1600e268d118d05000e53a905482bc30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127211
Commit-Queue: Aya Elsayed <ayaelattar@google.com>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756224}