Implement support for vp9 in ISO-BMFF

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 15fa9d66f86203684877d049d5e071bda01b509e..250e09968db3d9362860d9e73417e673d75df9a5 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -71468,8 +71468,8 @@ To add a new entry, add it with any value and run test to compute valid value.
 
 <enum name="MSECodec" type="int">
   <int value="0" label="(Unknown)"/>
-  <int value="1" label="VP8"/>
-  <int value="2" label="VP9"/>
+  <int value="1" label="WEBM VP8"/>
+  <int value="2" label="WEBM VP9"/>
   <int value="3" label="Vorbis"/>
   <int value="4" label="H.264"/>
   <int value="5" label="MPEG2 AAC"/>
@@ -71479,6 +71479,8 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="9" label="OPUS"/>
   <int value="10" label="HEVC"/>
   <int value="11" label="AC3"/>
+  <int value="12" label="MPEG4 VP8"/>
+  <int value="13" label="MPEG4 VP9"/>
 </enum>
 
 <enum name="MultiAccountUpdateBubbleUserAction" type="int">