Sending TaskFragment token to client for the launching activity

Activity#onCreate is called before receiving the TaskFragment
appeared event in the client process. So, the client split
controller created another split and resulted in unexpected
behaviors.

Bug: 194860679
Test: start activity to side
Test: wm presubmit

Change-Id: Iac34bd39376940c5c0224c8687ad9858a4190e20