usb: Add scale and jpeg converter in image_processor

Also set exif tags from metadata.

BUG=b:24674340
TEST=image has correct exif info.

Change-Id: If71b610475376f348d78d709982f7c19c5ad4df9
Reviewed-on: https://chromium-review.googlesource.com/455605
Commit-Ready: Heng-ruey Hsu <henryhsu@chromium.org>
Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
6 files changed