Add VideoRotation UMA Logging

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index aa24dd93a3078546bb5e9123861122a5157f05c4..e36c0964d90e08f8d9fe518fdff787f00142f373 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -10639,6 +10639,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <summary>Pixel format used in HTML5 video. Emitted on video load.</summary>
 </histogram>
 
+<histogram name="Media.VideoRotation" enum="VideoRotation">
+  <owner>suderman@chromium.org</owner>
+  <summary>Metadata rotation in mp4 videos. Emitted during demuxing.</summary>
+</histogram>
+
 <histogram name="Media.VideoVisibleAspectRatio">
   <owner>scherkus@chromium.org</owner>
   <summary>Visible aspect ratio of HTML5 video.</summary>
@@ -47897,6 +47902,13 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="7" label="YV12J"/>
 </enum>
 
+<enum name="VideoRotation" type="int">
+  <int value="0" label="VIDEO_ROTATION_0"/>
+  <int value="1" label="VIDEO_ROTATION_90"/>
+  <int value="2" label="VIDEO_ROTATION_180"/>
+  <int value="3" label="VIDEO_ROTATION_270"/>
+</enum>
+
 <enum name="ViewFileType" type="int">
   <int value="0" label="other"/>
   <int value="1" label=".3ga"/>