Decryptors can report kNoKey to WebMediaPlayer

media/base/pipeline.h

Index: media/base/pipeline.h
diff --git a/media/base/pipeline.h b/media/base/pipeline.h
index 6bca4778aa4b3dc33823604a2d68bf3ac74f2079..30707b3c329303bc7664f632f8741d79c9e36ae2 100644
--- a/media/base/pipeline.h
+++ b/media/base/pipeline.h
@@ -105,6 +105,8 @@ class MEDIA_EXPORT Pipeline : public DemuxerHost {
   //   |duration_change_cb| optional callback that will be executed whenever the
   //                        presentation duration changes.
   //   |add_text_track_cb| will be executed whenever a text track is added.
+  //   |waiting_for_decryption_key_cb| will be executed whenever the key needed
+  //                                   to decrypt the stream is not available.
   // It is an error to call this method after the pipeline has already started.
   void Start(Demuxer* demuxer,
              scoped_ptr<Renderer> renderer,
@@ -115,7 +117,8 @@ class MEDIA_EXPORT Pipeline : public DemuxerHost {
              const BufferingStateCB& buffering_state_cb,
              const PaintCB& paint_cb,
              const base::Closure& duration_change_cb,
-             const AddTextTrackCB& add_text_track_cb);
+             const AddTextTrackCB& add_text_track_cb,
+             const base::Closure& waiting_for_decryption_key_cb);
 
   // Asynchronously stops the pipeline, executing |stop_cb| when the pipeline
   // teardown has completed.
@@ -360,6 +363,7 @@ class MEDIA_EXPORT Pipeline : public DemuxerHost {
   PaintCB paint_cb_;
   base::Closure duration_change_cb_;
   AddTextTrackCB add_text_track_cb_;
+  base::Closure waiting_for_decryption_key_cb_;
 
   // Holds the initialized demuxer. Used for seeking. Owned by client.
   Demuxer* demuxer_;