Add runtime feature and property names for unprefixed CSS Transforms

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 af8a44487cfb35827eca4c60e41e5e7604503e2f..10b8ec01cd41c0f0343012547f1c3dcd33b09822 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -500,6 +500,12 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     case CSSPropertyJustifySelf: return 443;
     case CSSPropertyScrollBehavior: return 444;
     case CSSPropertyWillChange: return 445;
+    case CSSPropertyTransform: return 446;
+    case CSSPropertyTransformOrigin: return 447;
+    case CSSPropertyTransformStyle: return 448;
+    case CSSPropertyPerspective: return 449;
+    case CSSPropertyPerspectiveOrigin: return 450;
+    case CSSPropertyBackfaceVisibility: return 451;
 
     // Add new features above this line (don't change the assigned numbers of the existing
     // items) and update maximumCSSSampleId() with the new maximum value.
@@ -519,7 +525,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     return 0;
 }
 
-static int maximumCSSSampleId() { return 445; }
+static int maximumCSSSampleId() { return 451; }
 
 void UseCounter::muteForInspector()
 {