If I remember correctly we wanted a separate flag for #2 so that we could enable it on mobile incrementally, (I believe it changes the install prompt behavior?). I think that still applies, so unifying wouldn't be a good idea. If not, then +1 for unifying.

I'm OK with #4 implying #2 if unifying doesn't work out.

My understanding is that "PWA" is mainly a marketing name so we've been avoiding it in code (except that flag which I added before realizing this). That said, flags aren't meant to be permanent so it might be OK to add it in the flag.

#1 Good point, OK I will keep the flag #2 but make #4 imply #2.

Arguably, the flag is part of marketing since we tell people to activate it. It should use the branded name, not the internal name. (Though #enable-experimental-app-list says different.)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d487043f96cb39e2fc405cb7369257dcd432de4e

commit d487043f96cb39e2fc405cb7369257dcd432de4e
Author: Matt Giuca <mgiuca@chromium.org>
Date: Fri Nov 24 01:04:38 2017

Simplify Desktop PWA flags.

- desktop-pwa-windowing now implies experimental-app-banners.
- Renamed desktop-pwa-windowing to desktop-pwas. (This will de-activate
  the existing flag for anyone who has it turned on.)
- Updated flag descriptions in about:flags.
- Fixed code behind experimental-app-banners to use the function to
  check if it's turned on.

Note that the internal feature name DesktopPWAWindowing (i.e., what you
would use on the command line) has not changed, and is now a misnomer as
it also turns on experimental app banners.

Bug:  788072 
Tbr: msw@chromium.org
Change-Id: Ic39674c20313e632f427bb795557d70dce894599
Reviewed-on: https://chromium-review.googlesource.com/786357
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519038}
[modify] https://crrev.com/d487043f96cb39e2fc405cb7369257dcd432de4e/chrome/browser/about_flags.cc
[modify] https://crrev.com/d487043f96cb39e2fc405cb7369257dcd432de4e/chrome/browser/banners/app_banner_manager.cc
[modify] https://crrev.com/d487043f96cb39e2fc405cb7369257dcd432de4e/chrome/browser/extensions/extension_util.cc
[modify] https://crrev.com/d487043f96cb39e2fc405cb7369257dcd432de4e/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/d487043f96cb39e2fc405cb7369257dcd432de4e/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/d487043f96cb39e2fc405cb7369257dcd432de4e/chrome/browser/ui/toolbar/app_menu_model.cc