CSS Custom Properties (Variables)

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index 794e5246280616c7eac16ece4dcd6f35f3e28642..cc585767d7883b1c09eba420e92aba9fca99b9a6 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -537,6 +537,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     case CSSPropertyScrollSnapPointsY: return 501;
     case CSSPropertyScrollSnapCoordinate: return 502;
     case CSSPropertyScrollSnapDestination: return 503;
+    case CSSPropertyVariable: return 504;
 
     // 1. Add new features above this line (don't change the assigned numbers of the existing
     // items).
@@ -553,7 +554,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     return 0;
 }
 
-static int maximumCSSSampleId() { return 503; }
+static int maximumCSSSampleId() { return 504; }
 
 void UseCounter::muteForInspector()
 {