Notify draw for relaunch with preserved window

In case any logic depends on ActivityRecord#startRelaunching
~ WindowState#finishDrawing can receive paired invocation.

Fix: 264634241
Test: An activity calls recreate().
      There will be a log "finishDrawing of relaunch: Window".
Change-Id: I9406ab5cbca5b3c9c407a136bf4fcb97111d78b8