Decryptors can report kNoKey to WebMediaPlayer

media/filters/gpu_video_decoder.h

Index: media/filters/gpu_video_decoder.h
diff --git a/media/filters/gpu_video_decoder.h b/media/filters/gpu_video_decoder.h
index a4157b19cf7f4ad7f4360834726c9e5fdd3e8374..da195747d0823d986a7d7c2d64b83699b066406f 100644
--- a/media/filters/gpu_video_decoder.h
+++ b/media/filters/gpu_video_decoder.h
@@ -45,7 +45,8 @@ class MEDIA_EXPORT GpuVideoDecoder
   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;