- New sample code.
- Fix/improve some docs.
- Hide JobWorkItem Parcl constructor.
Also:
- Add new JobWorkItem API to get the number of times it has been
delivered.
- Do a bit more optimization of checking if a job is ready.
Bug: 37534393 API Review: JobInfo.Builder
Bug: 37544057 API Review: JobServiceEngine
Bug: 37544153 API Review: JobWorkItem
Test: bit CtsJobSchedulerTestCases:*
Change-Id: I66891a038fba752f45dcaed43e615fa9209b71fc
28d1b66134