ScaleManager#onSizeChange

This signal is dispatched when the size of the Display canvas changes or the size of the Game changes.
When invoked this is done after the Canvas size/position have been updated.

This signal is only called when a change occurs and a reflow may be required.
For example, if the canvas does not change sizes because of CSS settings (such as min-width)
then this signal will not be triggered.

Use this to handle responsive game layout options.

This is signaled from preUpdate (or pauseUpdate) even when the game is paused.