Add support for the object-fit CSS property.

Source/core/page/UseCounter.cpp

Index: Source/core/page/UseCounter.cpp
diff --git a/Source/core/page/UseCounter.cpp b/Source/core/page/UseCounter.cpp
index e941dee8ac3422ecca52cfc0faddc113ebb41bdf..c1f6802d797b850956007a08fc5197cf79958a0e 100644
--- a/Source/core/page/UseCounter.cpp
+++ b/Source/core/page/UseCounter.cpp
@@ -485,6 +485,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     case CSSPropertyTouchAction: return 421;
     case CSSPropertyGridArea: return 422;
     case CSSPropertyGridTemplate: return 423;
+    case CSSPropertyObjectFit: return 424;
 
     // Add new features above this line (don't change the assigned numbers of the existing
     // items) and update maximumCSSSampleId() with the new maximum value.
@@ -499,7 +500,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     return 0;
 }
 
-static int maximumCSSSampleId() { return 423; }
+static int maximumCSSSampleId() { return 424; }
 
 UseCounter::UseCounter()
 {