Update ExifInterface.getDateTime to support subseconds
Update ExifInterface.getDateTime to support subseconds

Also document that it returns local time.

Bug: 20638367
Change-Id: I6a1c35925e0555bcdcb079be0ca5b19a279a05a6

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base