Would be nice if flutter run only downloaded the necessary artifacts #6491
Description
I was on a train with bad wifi. It was painful.
I was trying to run the gallery on an iOS Simulator.
%flutter run
Building flutter tool...
Downloading package sky_engine... 8101ms
Running 'pub get' in sky_engine... 450ms
Downloading package sky_services... 596ms
Running 'pub get' in sky_services... 3139ms
Downloading package flutter_services... 1929ms
Running 'pub get' in flutter_services... 2294ms
Building Dart SDK summary... 1753ms
Downloading engine artifacts android-arm... 177027ms
Downloading engine artifacts android-arm-profile... 164117ms
Downloading engine artifacts android-arm-release... 115925ms
Downloading engine artifacts android-x64... 78964ms
Downloading engine artifacts android-x86... 78600ms
Downloading engine artifacts ios... 178979ms
Downloading engine artifacts ios-profile... 189778ms
Downloading engine artifacts ios-release... 152586ms
Downloading darwin-x64 tools... 232022ms
Downloading android-arm-profile/darwin-x64 tools... 34656ms
Downloading android-arm-release/darwin-x64 tools... 139862ms
Running 'pub get' in flutter_gallery... 870ms
FYI @danrubel