Only resuming starting dontWaitForPause activity once

For a starting activity that doesn't wait for pause, we can resume it
when ensuring visible activities when pausing back stacks. If this
happens, there is no need to try to resume it again.

Bug: 28853615
Change-Id: Iee40b80eb13ab3fd65fdce0c100c4051e64f229f
1 file changed