Lockscreen blur: after the screenshot is taken, handle the rest of the bitmap preparation async with display state change

Change-Id: Ieade432a561a012f442d8cde2f2f11f5e52f749a
Fix a fail from the backup transport fix

this file's name and this line init both lack any mention of backing things up...

Change-Id: I36ad254695d14e512e58c596228fe69a49c89dfd