[Experiment] Alpha Channel Support

api/video_codecs/video_decoder.h

Index: api/video_codecs/video_decoder.h
diff --git a/api/video_codecs/video_decoder.h b/api/video_codecs/video_decoder.h
index 5897901346ce93a73d1144a3fb6542ec36b512e1..49947543c16450a377b702ddf0c90af97395f0a5 100644
--- a/api/video_codecs/video_decoder.h
+++ b/api/video_codecs/video_decoder.h
@@ -82,6 +82,13 @@ class VideoDecoder {
   virtual const char* ImplementationName() const { return "unknown"; }
 };
 
+class VideoDecoderFactoryEx {
+ public:
+  virtual VideoDecoder* Create() = 0;
+  virtual void Destroy(VideoDecoder* decoder) = 0;
+  virtual ~VideoDecoderFactoryEx() {}
+};
+
 }  // namespace webrtc
 
 #endif  // API_VIDEO_CODECS_VIDEO_DECODER_H_