Enhance recent sync log in dumpsys content

- Add "Per Adapter History" section that has recent activities per adapter. Example:
  mxxxx@gmail.com/com.google u0 [com.android.calendar]
    2017-06-19 14:19:07 success Source=LOCAL Elapsed=0s Reason=10014 Extras=[upload=true ]
    2017-06-19 14:19:06 success Source=SERVER Elapsed=16s Reason=10014 Extras=[feed=#contacts@group.v.calendar.google.com ]
  mxxxx@gmail.com/com.google u0 [com.android.chrome]
    2017-06-19 13:26:25 canceled Source=POLL Elapsed=0s Reason=AccountsUpdated Extras=[initialize=true ]
  mxxxx@gmail.com/com.google u0 [com.android.contacts]

- Improve pending/periodic syncs with better formatting, and sort them in a sane order.

Bug: 38498544
Bug: 62391411
Test: manual test with "dumpsys content"
Change-Id: I947a9255230f27a7f438d648da324787fdf16f55