Decryptors can report kNoKey to WebMediaPlayer

media/filters/decrypting_demuxer_stream.h

Index: media/filters/decrypting_demuxer_stream.h
diff --git a/media/filters/decrypting_demuxer_stream.h b/media/filters/decrypting_demuxer_stream.h
index f66f9ab757dd09e4aa489b535d1a45f25dd4a2e4..e0a4580c27244179129706528f82458c78d392e6 100644
--- a/media/filters/decrypting_demuxer_stream.h
+++ b/media/filters/decrypting_demuxer_stream.h
@@ -36,7 +36,8 @@ class MEDIA_EXPORT DecryptingDemuxerStream : public DemuxerStream {
   ~DecryptingDemuxerStream() override;
 
   void Initialize(DemuxerStream* stream,
-                  const PipelineStatusCB& status_cb);
+                  const PipelineStatusCB& status_cb,
+                  const base::Closure& waiting_for_encryption_key_cb);
 
   // Cancels all pending operations and fires all pending callbacks. If in
   // kPendingDemuxerRead or kPendingDecrypt state, waits for the pending
@@ -104,6 +105,7 @@ class MEDIA_EXPORT DecryptingDemuxerStream : public DemuxerStream {
   PipelineStatusCB init_cb_;
   ReadCB read_cb_;
   base::Closure reset_cb_;
+  base::Closure waiting_for_encryption_key_cb_;
 
   // Pointer to the input demuxer stream that will feed us encrypted buffers.
   DemuxerStream* demuxer_stream_;