Fill out implemenation of PingSyncSynchronizer. This class is not
enabled yet as it is utilized by EasService.

Change-Id: Iba3faef51df89b7fd103f43a33d7a401466a344c

Conflicts:
	src/com/android/exchange/service/EasService.java
	src/com/android/exchange/service/PingSyncSynchronizer.java
	src/com/android/exchange/service/PingTask.java
4 files changed