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

media/base/audio_video_metadata_extractor.h

Index: media/base/audio_video_metadata_extractor.h
diff --git a/media/base/audio_video_metadata_extractor.h b/media/base/audio_video_metadata_extractor.h
index 7ea73e20ab324af8830c6bc42312a7f899e7ecf5..afea412f4847b2d45d69bbcf9ac9e4f08a22c1ec 100644
--- a/media/base/audio_video_metadata_extractor.h
+++ b/media/base/audio_video_metadata_extractor.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_BASE_AUDIO_VIDEO_METADATA_EXTRACTOR_H_
 #define MEDIA_BASE_AUDIO_VIDEO_METADATA_EXTRACTOR_H_
 
+#include <map>
 #include <string>
 
 #include "base/basictypes.h"
@@ -51,6 +52,8 @@ class MEDIA_EXPORT AudioVideoMetadataExtractor {
   const std::string& title() const;
   int track() const;
 
+  const std::map<std::string, std::string>& raw_tags() const;
+
  private:
   void ExtractDictionary(AVDictionary* metadata);
 
@@ -74,6 +77,8 @@ class MEDIA_EXPORT AudioVideoMetadataExtractor {
   std::string title_;
   int track_;
 
+  std::map<std::string, std::string> raw_tags_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioVideoMetadataExtractor);
 };