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JEITA EXIF image orientation is a number in [1..8]. PIEX C++ defaults
to 1 if there is no image orientation or its value is invalid. Return
the value in the PiexLoaderResponse and let the client code deal with
converting it to other types [1].

[1] In files app, make image_request_task.js convert the value in the
PiexLoaderResponse to ImageOrientation type. No change in behavior.

Bug: 1132695
Change-Id: I728680d17c31426d72b6b09bd52ee821540cbcd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432231Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Auto-Submit: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811119}