This patch allows the user to change the size of the window (or the resolution in fullscreen mode) using the new bge.render.resize() method. This only works in the Blenderplayer since it doesn't make a whole lot of sense for the embedded player. Also, I'm uncertain on the name "resize" for the method. The supplied blendfile makes use of the new method when you press the spacebar, but you'll have to save it to a runtime first (or load it via blenderplayer resize.blend). You might want to change the size in the script before running depending on your screen resolution.