To repro:
Play, go fullscreen, pause, exit fullscreen, seek. If you don't do the last seek you can continue playing.

The audio renderer gets stuck in kFlushing. The events look like the following, with nothing after it:

[VERBOSE1:pipeline_impl.cc(390)] kPlaying -> kSeeking
[VERBOSE1:render_media_log.cc(30)] MediaEvent: PIPELINE_STATE_CHANGED {"pipeline_state":"kSeeking"}
[VERBOSE1:renderer_impl.cc(169)] Flush
[VERBOSE1:renderer_impl.cc(418)] FlushAudioRenderer
[VERBOSE1:audio_renderer_impl.cc(270)] Flush
[VERBOSE1:audio_renderer_impl.cc(934)] ChangeState_Locked : 4 -> 2