Decryptors can report kNoKey to WebMediaPlayer

media/base/audio_renderer.h

Index: media/base/audio_renderer.h
diff --git a/media/base/audio_renderer.h b/media/base/audio_renderer.h
index 7d0e3d761fad8b5aacddcc566629dc6bcc3fee30..586936a1e81bc4e5f94da23ffc12bd2f6904e514 100644
--- a/media/base/audio_renderer.h
+++ b/media/base/audio_renderer.h
@@ -39,13 +39,18 @@ class MEDIA_EXPORT AudioRenderer {
   // |ended_cb| is executed when audio rendering has reached the end of stream.
   //
   // |error_cb| is executed if an error was encountered after initialization.
-  virtual void Initialize(DemuxerStream* stream,
-                          const PipelineStatusCB& init_cb,
-                          const SetDecryptorReadyCB& set_decryptor_ready_cb,
-                          const StatisticsCB& statistics_cb,
-                          const BufferingStateCB& buffering_state_cb,
-                          const base::Closure& ended_cb,
-                          const PipelineStatusCB& error_cb) = 0;
+  //
+  // |waiting_for_decryption_key_cb| is called whenever the key needed to
+  // decrypt the stream is not available.
+  virtual void Initialize(
+      DemuxerStream* stream,
+      const PipelineStatusCB& init_cb,
+      const SetDecryptorReadyCB& set_decryptor_ready_cb,
+      const StatisticsCB& statistics_cb,
+      const BufferingStateCB& buffering_state_cb,
+      const base::Closure& ended_cb,
+      const PipelineStatusCB& error_cb,
+      const base::Closure& waiting_for_decryption_key_cb) = 0;
 
   // Returns the TimeSource associated with audio rendering.
   virtual TimeSource* GetTimeSource() = 0;