tree 20e6c80dcddbc3c34d4aa655f7bd636ae0c9b3b1
parent 7abb36599d9537296d9a51f766152025c6ed0491
author Mark Lu <Mark_Lu@htc.com> 1446794775 +0800
committer Mark Lu <Mark_Lu@htc.com> 1447053888 +0000

Fix system watchdog timeout when reading too many usage events.

Symptom:
As issue link:
https://code.google.com/p/android/issues/detail?id=193100

RootCause:
UsageStatsService.onDisplayChanged executed in system main thread,
If calling UsageStatsManager.queryEvents with too many events before it
(i.e. in daily usage event file,
too many activity resume / pause events or configuration change
during monkey test),
System will be blocked then watchdog timeout.

Solution:
Let display listener executed in background thread handler

Change-Id: Ic894d112612400ed8fb7ba843b3309fdc4f66fe1