Start on test cases for bug 6672 (Exif orientation support), follow up to r79845.

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.