I work in a company where I have to tell designers as well. So despite any hard mapped check list, it always helps if you make the designer understand a bit on how the Android works.
Don't forget that color codes, XML drawables (borders, gradients) and 9-patch are way more efficient than static PNGs.
Then I make him do everything just for the Galaxy Nexus on XHDPI and only after the whole development is complete that I ask for the other resized assets (because assets tend to change throughout the project and then I don't have to be updating all of them).
Despite what is on the mock-ups is just a few more assets:
- launcher icon,
- high-res launcher (512 x 512)
- promotional graphs (180w x 120h)
- feature graphic (1024 x 500)
the other you'll use registering on Google Play is the screen shots which you can get from the real app, after it's complete.