Jason Chiu e19658ac36 Fix ConcurrentModificationException in SliceBackgroundWorker
- Two different threads could call SliceBackgroundWorker.getInstance()
  at the same time and caused ConcurrentModificationException
- Add a new API overloading getInstance for each slice to get a nullable
  worker since there is no result data then
- Only slice provider can create a new worker instance in main thread

Test: robotest
Change-Id: I560529bb6034ec22263418adeb7f3ccebf879196
Fixes: 121043385
2019-01-07 20:10:49 +00:00
2018-12-05 08:15:17 +08:00
2018-12-18 09:51:08 +00:00
2018-12-18 09:51:08 +00:00
2018-12-19 20:24:23 -08:00
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