Add 'priority' key to CSSProperties.in

third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h

Index: third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h
diff --git a/third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h b/third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h
index c8df1616d970f1aa01bf748e99a6e400aaa4f62b..11247b5bd8b996822eb41d71c61f2ac6538f2c18 100644
--- a/third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h
+++ b/third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h
@@ -82,9 +82,9 @@ inline CSSPropertyID CSSPropertyPriorityData<HighPropertyPriority>::last() {
   static_assert(
       CSSPropertyZoom == CSSPropertyColor + 21,
       "CSSPropertyZoom should be the end of the high priority property range");
-  static_assert(
-      CSSPropertyTextRendering == CSSPropertyZoom - 1,
-      "CSSPropertyTextRendering should be immediately before CSSPropertyZoom");
+  static_assert(CSSPropertyWritingMode == CSSPropertyZoom - 1,
+                "CSSPropertyWritingMode should be immediately before "
+                "CSSPropertyZoom");
   return CSSPropertyZoom;
 }