Add support for external video renderers in mojo.

media/mojo/services/media_type_converters.h

Index: media/mojo/services/media_type_converters.h
diff --git a/media/mojo/services/media_type_converters.h b/media/mojo/services/media_type_converters.h
index fba78dcc8d1dbbd7aecf2013a4af474ee6b65b11..9901865c63e491500d0815a91af63193980c5dd2 100644
--- a/media/mojo/services/media_type_converters.h
+++ b/media/mojo/services/media_type_converters.h
@@ -10,6 +10,7 @@
 
 namespace media {
 class AudioDecoderConfig;
+class VideoDecoderConfig;
 class DecoderBuffer;
 }
 
@@ -37,6 +38,15 @@ struct TypeConverter<media::AudioDecoderConfig, AudioDecoderConfigPtr> {
   static media::AudioDecoderConfig Convert(const AudioDecoderConfigPtr& input);
 };
 
+template <>
+struct TypeConverter<VideoDecoderConfigPtr, media::VideoDecoderConfig> {
+  static VideoDecoderConfigPtr Convert(const media::VideoDecoderConfig& input);
+};
+template <>
+struct TypeConverter<media::VideoDecoderConfig, VideoDecoderConfigPtr> {
+  static media::VideoDecoderConfig Convert(const VideoDecoderConfigPtr& input);
+};
+
 }  // namespace mojo
 
 #endif  // MEDIA_MOJO_SERVICES_MEDIA_TYPE_CONVERTERS_H_