Since PIEX can now return an uncompressed RGB thumbnail, check the type of the image...

Since PIEX can now return an uncompressed RGB thumbnail, check the type of the image before treating it as a JPEG.

Highlights of new PIEX:
* PIEX can now return JPEG compressed image or uncompressed RGB image
* Add IsOfType() and GEtNumberofBytesForIsOfType() to image_type_recognition_lite
* Add GetDngInformation() and GetOrientation() to piex
* Remove deprecated data entries from piex_types

BUG=b/27214608, b/28119810
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Review URL: https://codereview.chromium.org/1883783002