am 310db394: (-s ours) Merge "DO NOT MERGE: Do not set the background to null for video." into gb-ub-photos-arches

* commit '310db394adcdb8677b9a3d0f37a4abee63bdbb50':
  DO NOT MERGE: Do not set the background to null for video.
tree: f4b12bf65b6a2b6ef73b56b9ddb7f91a60f9e9a8
  1. gallerycommon/
  2. src/
  3. src_pd/
  4. tests/