Capture HDR thumbnail from surface control

bug: 113609172
bug: 135717526
test:
- push hdr clips to /sdcard/ and reboot to let it scan,
check in Files and Photos app that the generated thumbnails
show color in hdr.
- Run local testing that use MetadataRetriever to extract
thumbnail of HDR clips, check output bitmap is HDR

Change-Id: I5814e05fd723d23994c2d6961021a1f911db7056