[automerger] DO NOT MERGE Rework thumbnail cleanup am: b514ce9b38 am: b8dad6c644 am: 019eec3923 skipped: 9d13b0f6ca am: 4ef2cbc58d am: 31ee079d5f am: 6100f6d3b2 am: c077fab855

Change-Id: Ia2f661ae02c925da5d6e05f96983cc3f606cd9bd