This is needed to update an app's layout when a soft keyboard is shown

Fixes #5141

Closes https://github.com/flutter/flutter/issues/6037

* For reals allow Gallery to be installed by Nexus 5, 5X

* fix for long line

Cargo culted from http://stackoverflow.com/questions/24690739/nexus-5-galaxy-s5-and-some-other-devices-are-showing-not-compatible-in-google

BUG=https://github.com/flutter/flutter/issues/5373

See https://github.com/flutter/flutter/issues/5570

Change the Gallery sample Android package to not conflict with the version published in Play (#5579)

* new launcher icons for android

* two more sizes for android launcher icons

* updates from the flutter gallery rename

* rename ids to io.flutter.gallery

@HansMuller