Ignore sink start attempts when no frames are present.

media/renderers/video_renderer_impl.cc

Index: media/renderers/video_renderer_impl.cc
diff --git a/media/renderers/video_renderer_impl.cc b/media/renderers/video_renderer_impl.cc
index 148c4df63d383e628bd89f98e546b54d62b78117..6adc08dc76ffb16ff083641fa18981a088be4c3a 100644
--- a/media/renderers/video_renderer_impl.cc
+++ b/media/renderers/video_renderer_impl.cc
@@ -299,8 +299,17 @@ void VideoRendererImpl::OnTimeStateChanged(bool time_progressing) {
   if (time_progressing_) {
     // If only an EOS frame came in after a seek, the renderer may not have
     // received the ended event yet though we've posted it.
-    if (!rendered_end_of_stream_)
-      StartSink();
+    if (rendered_end_of_stream_)
+      return;
+
+    // If we have no frames queued, there is a pending buffering state change in
+    // flight and we should ignore the start attempt.
+    if (!algorithm_->frames_queued()) {
+      DCHECK_EQ(buffering_state_, BUFFERING_HAVE_NOTHING);
+      return;
+    }
+
+    StartSink();
   } else {
     StopSink();