🤝 Add flag to force showing TWA disclosure.

Add a flag to force showing the disclosure for developer convenience.
Also trigger even when there isn't an active tab yet.

Bug: 813100
Change-Id: I3ccd820d58f82040723a8f8a72097262ba374b82
Reviewed-on: https://chromium-review.googlesource.com/1116922
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574591}
3 files changed