Transition media element to HAVE_CURRENT_DATA upon underflow.

media/renderers/renderer_impl.cc

Index: media/renderers/renderer_impl.cc
diff --git a/media/renderers/renderer_impl.cc b/media/renderers/renderer_impl.cc
index f6231cf6142fddbe09c7dfa86ba0d8432af408d9..69a9f7c31e447a432a79121add79a8b73d6e103a 100644
--- a/media/renderers/renderer_impl.cc
+++ b/media/renderers/renderer_impl.cc
@@ -691,9 +691,7 @@ void RendererImpl::OnBufferingStateChange(DemuxerStream::Type type,
   // Renderer underflowed.
   if (!was_waiting_for_enough_data && WaitingForEnoughData()) {
     PausePlayback();
-
-    // TODO(scherkus): Fire BUFFERING_HAVE_NOTHING callback to alert clients of
-    // underflow state http://crbug.com/144683
+    client_->OnBufferingStateChange(BUFFERING_HAVE_NOTHING);
     return;
   }