The AsyncTasks started in DataProcessManager are not cancelled when
fragment is closed. Introduce helper class LifecycleAwareAsyncTask to
cancel AsyncTask automatically when lifecycle is stopped.
Bug: 384473507
Flag: EXEMPT bug fix
Test: Unit test & open/close battery usage screen 1000 times
Change-Id: I060f559fa85cc5feb9a42cb8dcc0581782a91d09