Decryptors can report kNoKey to WebMediaPlayer

media/filters/vpx_video_decoder.h

Index: media/filters/vpx_video_decoder.h
diff --git a/media/filters/vpx_video_decoder.h b/media/filters/vpx_video_decoder.h
index 72d7a2c963feec0237845d8ab7ddc366e6070a16..611d1af354de0daa4d1bbd19ceeb7dc33ad7b151 100644
--- a/media/filters/vpx_video_decoder.h
+++ b/media/filters/vpx_video_decoder.h
@@ -36,7 +36,8 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
   void Initialize(const VideoDecoderConfig& config,
                   bool low_delay,
                   const PipelineStatusCB& status_cb,
-                  const OutputCB& output_cb) override;
+                  const OutputCB& output_cb,
+                  const base::Closure& waiting_for_encryption_key_cb) override;
   void Decode(const scoped_refptr<DecoderBuffer>& buffer,
               const DecodeCB& decode_cb) override;
   void Reset(const base::Closure& closure) override;