SkJpegSourceMgr: Add blank files

These files need to be included in the Chromium build.

Bug: skia:14031
Change-Id: I90f04b08b2aa73e3ad0822a59cb4b66ef8d96568
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/633464
Commit-Queue: Christopher Cameron <ccameron@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed