Plumb callbacks from mojo media service to client.

media/mojo/common/media_type_converters.h

Index: media/mojo/common/media_type_converters.h
diff --git a/media/mojo/common/media_type_converters.h b/media/mojo/common/media_type_converters.h
index 0fea86a84841c24c54c0f1bcecd144521117e293..d652fd3d41d9f40a4b37121b62f48eaf359a9fbf 100644
--- a/media/mojo/common/media_type_converters.h
+++ b/media/mojo/common/media_type_converters.h
@@ -18,6 +18,7 @@ class AudioDecoderConfig;
 class DecoderBuffer;
 class DecryptConfig;
 class EncryptionScheme;
+class PipelineStatistics;
 class VideoDecoderConfig;
 class VideoFrame;
 struct CdmConfig;
@@ -152,6 +153,19 @@ struct TypeConverter<scoped_refptr<media::VideoFrame>,
       const media::mojom::VideoFramePtr& input);
 };
 
+template <>
+struct TypeConverter<media::mojom::PipelineStatisticsPtr,
+                     media::PipelineStatistics> {
+  static media::mojom::PipelineStatisticsPtr Convert(
+      const media::PipelineStatistics& input);
+};
+template <>
+struct TypeConverter<media::PipelineStatistics,
+                     media::mojom::PipelineStatisticsPtr> {
+  static media::PipelineStatistics Convert(
+      const media::mojom::PipelineStatisticsPtr& input);
+};
+
 }  // namespace mojo
 
 #endif  // MEDIA_MOJO_COMMON_MEDIA_TYPE_CONVERTERS_H_