[quickview] Add JPEG test image containing EXIF metadata

Define the image as having no mime type, so that integration tests (to
come) can verify the mime shown in QuickView tests.

Minor: make ENTRIES comments about having a mime, or file extension, a
bit more uniform and assume the reason for not having them is for test
purposes (integration, unittest, etc).

No-try: true
Bug: 965370
Change-Id: I8b4c332b3d41647476261eb18fff101aacaa4134
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1647613
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667894}
2 files changed