Migrate Flutter Gallery test to NNBD

[blasten]

Tracks the migration to NNBD, which includes all the dependencies.

Dependencies

Dependency	Current version	Owner	Issue/PR
connectivity	0.4.9+2	Flutter Ecosystem
connectivity_for_web	0.3.1+2	Flutter Ecosystem
connectivity_macos	0.1.0+4	Flutter Ecosystem
connectivity_platform_interface	1.0.6	Flutter Ecosystem
device_info	0.4.2+7	Flutter Ecosystem
device_info_platform_interface	1.0.1	Flutter Ecosystem
plugin_platform_interface	1.0.2	Flutter Ecosystem	flutter/plugins#3115
url_launcher	5.5.3	Flutter Ecosystem
url_launcher_linux	0.0.1+1	Flutter Ecosystem
url_launcher_macos	0.0.1+7	Flutter Ecosystem
url_launcher_platform_interface	1.0.8	Flutter Ecosystem
url_launcher_web	1.3+2	Flutter Ecosystem
video_player	0.10.6	@blasten	flutter/plugins#3045
video_player_platform_interface	1.0.5	@blasten	flutter/plugins#3045
video_player_web	0.1.2+3	Flutter Ecosystem
flutter		Flutter Framework	dart-lang/sdk#40146
flutter_web_plugins		@ditman	#69843
intl	0.16.1	Dart SDK
pub_semver	1.4.4	Dart SDK
platform_detect	1.4.0	@ditman	#66385
scoped_model	1.0.1	3P
pigeon	0.1.10	@gaaclarke	#59118

/cc @pcsosinski

[ditman]

I'll find out if anybody's working on flutter_web_plugins, and take it next if nobody is.

(This one depends on flutter/foundation.dart and flutter/servics.dart being migrated in a couple of places)

[stuartmorgan]

url_launcher_windows will be on this list as of a couple of days ago.

[stuartmorgan]

I just checked all the desktop plugins (url_launcher_windows/macos/linux, connectivity_macos) and they are all using the traditional model of implementing a shared platform channel interface, so none of them have any Dart code outside of the example/ (which presumably won't need to be migrated for Gallery)

[kevmoo]

As discussed elsewhere, the dependency on scoped_model should likely be dropped.

• It's a 1-file package. (Should be easy to replace/inline)
• It hasn't been touched in ~2 years

CC @pcsosinski

[github-actions]

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