Tracks GVR version crossed with headset type using UMA.

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 f5f47285828c66553d647aae2c867d072cdf2777..d85ab59b2d94b9a9867a512d7dc8fe494ae3cc6d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22529,6 +22529,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GVRVersionCrossedVRViewerType"
+    enum="GVRVersionCrossedVRViewerType">
+  <owner>tiborg@chromium.org</owner>
+  <summary>
+    Cross product of the GVR version and the headset being used for VR.
+  </summary>
+</histogram>
+
 <histogram name="Hardware.Display.Count.OnChange">
   <owner>erikchen@chromium.org</owner>
   <summary>
@@ -100054,6 +100062,31 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Broadcast"/>
 </enum>
 
+<enum name="GVRVersionCrossedVRViewerType" type="int">
+  <int value="0" label="GVR_OLDER_AND_UNKNOWN_TYPE"/>
+  <int value="1" label="GVR_1_10_AND_UNKNOWN_TYPE"/>
+  <int value="2" label="GVR_1_20_AND_UNKNOWN_TYPE"/>
+  <int value="3" label="GVR_1_30_AND_UNKNOWN_TYPE"/>
+  <int value="4" label="GVR_1_40_AND_UNKNOWN_TYPE"/>
+  <int value="5" label="GVR_NEWER_AND_UNKNOWN_TYPE"/>
+  <int value="6" label="GVR_OTHER_AND_UNKNOWN_TYPE"/>
+  <int value="7" label="GVR_OLDER_AND_CARDBOARD"/>
+  <int value="8" label="GVR_1_10_AND_CARDBOARD"/>
+  <int value="9" label="GVR_1_20_AND_CARDBOARD"/>
+  <int value="10" label="GVR_1_30_AND_CARDBOARD"/>
+  <int value="11" label="GVR_1_40_AND_CARDBOARD"/>
+  <int value="12" label="GVR_NEWER_AND_CARDBOARD"/>
+  <int value="13" label="GVR_OTHER_AND_CARDBOARD"/>
+  <int value="14" label="GVR_OLDER_AND_DAYDREAM"/>
+  <int value="15" label="GVR_1_10_AND_DAYDREAM"/>
+  <int value="16" label="GVR_1_20_AND_DAYDREAM"/>
+  <int value="17" label="GVR_1_30_AND_DAYDREAM"/>
+  <int value="18" label="GVR_1_40_AND_DAYDREAM"/>
+  <int value="19" label="GVR_NEWER_AND_DAYDREAM"/>
+  <int value="20" label="GVR_OTHER_AND_DAYDREAM"/>
+  <int value="21" label="GVR_NONE"/>
+</enum>
+
 <enum name="GzipEncodingFixupResult" type="int">
   <int value="0" label="Gzip encoding left as-is"/>
   <int value="1" label="MIME type indicated GZIP content"/>