Decryptors can report kNoKey to WebMediaPlayer

media/filters/decrypting_demuxer_stream.cc

Index: media/filters/decrypting_demuxer_stream.cc
diff --git a/media/filters/decrypting_demuxer_stream.cc b/media/filters/decrypting_demuxer_stream.cc
index 601fd4681b7b9b6114971556ead33faf0152b55c..c399942676615382ccaf638ff564e8540f4e3fd2 100644
--- a/media/filters/decrypting_demuxer_stream.cc
+++ b/media/filters/decrypting_demuxer_stream.cc
@@ -39,8 +39,10 @@ DecryptingDemuxerStream::DecryptingDemuxerStream(
       key_added_while_decrypt_pending_(false),
       weak_factory_(this) {}
 
-void DecryptingDemuxerStream::Initialize(DemuxerStream* stream,
-                                         const PipelineStatusCB& status_cb) {
+void DecryptingDemuxerStream::Initialize(
+    DemuxerStream* stream,
+    const PipelineStatusCB& status_cb,
+    const base::Closure& waiting_for_encryption_key_cb) {
   DVLOG(2) << __FUNCTION__;
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK_EQ(state_, kUninitialized) << state_;
@@ -49,6 +51,7 @@ void DecryptingDemuxerStream::Initialize(DemuxerStream* stream,
   weak_this_ = weak_factory_.GetWeakPtr();
   demuxer_stream_ = stream;
   init_cb_ = BindToCurrentLoop(status_cb);
+  waiting_for_encryption_key_cb_ = waiting_for_encryption_key_cb;
 
   InitializeDecoderConfig();
 
@@ -311,6 +314,7 @@ void DecryptingDemuxerStream::DeliverBuffer(
     }
 
     state_ = kWaitingForKey;
+    waiting_for_encryption_key_cb_.Run();
     return;
   }