Satisfy charging constraint earlier for top apps.

Several releases ago, we delayed the CHARGING broadcast to ~15 minutes
after the device was plugged in. This means that any job that specifies
a charging constraint won't have the constraint satisfied until 15 minutes
after the device is plugged in. If such a job's setting is explicitly set
by the user and the user plugs in their device while the app is on top,
they will see that the work doesn't start immediately. This would be
confusing for the user. We now the top app's charging constraint jobs
as satisfied when the device is plugged in to avoid this confusion. If
any TOP app's charging constraint jobs start while the app is on top,
the job will be allowed to continue running after the user leaves the
app as long as the device is plugged in. Any jobs that didn't start will
be treated regularly and will have to wait for the CHARGING broadcast.

Bug: 198624541
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/job
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/job
Test: atest CtsJobSchedulerTestCases
Change-Id: I914176d7bf9fd4a8998c05d411483bd4607589f2