Media Metadata API: Extract raw tags for audio/video.

chrome/utility/media_galleries/media_metadata_parser.cc

Index: chrome/utility/media_galleries/media_metadata_parser.cc
diff --git a/chrome/utility/media_galleries/media_metadata_parser.cc b/chrome/utility/media_galleries/media_metadata_parser.cc
index abdb2e666633ac053f2e68bec018e709e68d8a3a..84b56afc6c16382d8f0075a2700282109f299cca 100644
--- a/chrome/utility/media_galleries/media_metadata_parser.cc
+++ b/chrome/utility/media_galleries/media_metadata_parser.cc
@@ -61,6 +61,12 @@ scoped_ptr<MediaMetadataParser::MediaMetadata> ParseAudioVideoMetadata(
   SetStringScopedPtr(extractor.title(), &metadata->title);
   SetIntScopedPtr(extractor.track(), &metadata->track);
 
+  for (std::map<std::string, std::string>::const_iterator it =
+           extractor.raw_tags().begin();
+       it != extractor.raw_tags().end(); ++it) {
+    metadata->raw_tags.additional_properties.SetString(it->first, it->second);
+  }
+
   return metadata.Pass();
 }