JobScheduler: handle connectivity action in bg looper

in rare cases InputDispatcher relies on the SystemServer to enqueue
the input events and wake it up (eg. with some accessibility services
enabled which have their own inputfilters).Receivers in the main thread
may block events dispatching and then we will peceive jank in windows.

issue: https://code.google.com/p/android/issues/detail?id=204067



Change-Id: I1f47cc5cb8fb2b2aa0cee7a8ed4bf50efb81e477
Signed-off-by: wangshujie <wangshujie@xiaomi.com>