Start on test cases for bug 6672 (Exif orientation support), follow up to r79845.
Unfortunately seem to be hitting a wall right off at checking width & height; BitmapHandler reports back the pre-rotation width & height, leading to the oddity that a file that's clearly 1024px tall and 768px wide reports itself as 1024px wide and 768px tall.
Haven't gotten to generating rotated output to confirm file size. :)
Marked test case as broken pending fix so it doesn't add to surprise regressions in test reports.