color: Add histograms for gamut

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 22342906434f9646aa5b463d3414c7827ed9aee1..168e7f1d8d98a2386989a883126132cb98306c9a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -88726,6 +88726,20 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="10" label="GammaNamed"/>
 </enum>
 
+<enum name="Gamut" type="int">
+  <int value="0" label="GamutUnknown"/>
+  <int value="1" label="GamutLessThanNTSC"/>
+  <int value="2" label="GamutNTSC"/>
+  <int value="3" label="GamutSRGB"/>
+  <int value="4" label="GamutAlmostP3"/>
+  <int value="5" label="GamutP3"/>
+  <int value="6" label="GamutAdobeRGB"/>
+  <int value="7" label="GamutWide"/>
+  <int value="8" label="GamutBT2020"/>
+  <int value="9" label="GamutProPhoto"/>
+  <int value="10" label="GamutUltraWide"/>
+</enum>
+
 <enum name="GarbageCollectionReason" type="int">
   <int value="0" label="kUnknown"/>
   <int value="1" label="kAllocationFailure"/>