[CSS Grid Layout] Implement 'justify-self' parsing

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 d0de31e1390ff731a1130981b4fda2f0a5c6a86d..96669e8031b98daadbd9182e4d22acb843ad26e2 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -496,6 +496,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     case CSSPropertyColumnFill: return 440;
     case CSSPropertyTextJustify: return 441;
     case CSSPropertyTouchActionDelay: return 442;
+    case CSSPropertyJustifySelf: return 443;
 
     // Add new features above this line (don't change the assigned numbers of the existing
     // items) and update maximumCSSSampleId() with the new maximum value.
@@ -516,7 +517,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     return 0;
 }
 
-static int maximumCSSSampleId() { return 442; }
+static int maximumCSSSampleId() { return 443; }
 
 UseCounter::UseCounter()
 {