Add VideoRotation UMA Logging

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index e23116f55fedc8d537a3ea7e69b01dc6211f5aa7..9e5bac07a1140d96ec6cf77cb5cb8dfaecfa3ba6 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -13,6 +13,7 @@
 #include "base/callback_helpers.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ -134,6 +135,8 @@ FFmpegDemuxerStream::FFmpegDemuxerStream(FFmpegDemuxer* demuxer,
           LOG(ERROR) << "Unsupported video rotation metadata: " << rotation;
           break;
       }
+      UMA_HISTOGRAM_ENUMERATION(
+          "Media.VideoRotation", video_rotation_, VIDEO_ROTATION_MAX + 1);

[scherkus (not reviewing), 2014/07/17 01:26:18]

I believe we'll want this logged inside of webmediaplayer_impl.cc inside of the
metadata callback

otherwise this path may end up logging rotation values for videos we don't end
up playing

 
       break;
     case AVMEDIA_TYPE_SUBTITLE: