The size() command will be handled differently on Android, but it's
completely ignored at the moment.

In general, the width and height of a sketch will simply be that of the
screen area, unless the Processing View class is embedded into something else.

However, we still need to be able to toggle between the 2D and 3D
renderers, which will likely be handled with a "getRenderer()" method. For
beginners, the preprocessor will likely convert the size() command to a
getRenderer() method internally.