Bug 741 HiDPI: Fix OSX NEWT Offscreen Size Regression from commit 56d60b36798fa8dae48bf2aa5e2de6f3178ab0d1

Fix regression of commit 56d60b36798fa8dae48bf2aa5e2de6f3178ab0d1:
  createWindow(..) was issuing sizeChanged(..) to ensure size notification,
  however - the offscreen case used the dummy size 64x64.

  Fix issues the notifications in caller w/ true size.
Bug 741 HiDPI: Add missing window -> pixel unit conversion in AWTNewtEventFactory (e.g. for NewtCanvasAWT)