Make sure to deliver broadcasts immediately when waiting for idle

wait-for-broadcast-idle might make some deferred broadcasts immediately
deliverable.  Unfortuantely we were not necessarily making sure to
resume delivery as well.  Now we do.

Bug: 126596818
Test: manual
Test: tests/ActivityTests
Change-Id: I49303824cfcd0999b15a6b232b9596a4a28541c0