Once it's ready, we will flip over from GLFW to GTK, as we did for Windows. The tasks here are:

• Burn down https://github.com/flutter/flutter/projects/142 so we have parity. (We don't necessarily need to hit zero on that list; some things there, like the resource context, aren't critical in the short term.)
• Start uploading the GTK library (can be done in parallel; I'll do that shortly).
• Make an initial Runner template that we're reasonably happy with (doesn't need to be stabilized; we can continue to iterate as we currently do with GLFW).
• Update flutter_tool to download/install the new library.
• Add the necessary requirements to the flutter/plugins Linux desktop Dockerfile so the switch doesn't break the builds there.
• Update flutter_tool to use the new template.
• Stop uploading the GLFW library.

/cc @robert-ancell