CSS Custom Properties (Variables)

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 58a6fbb7c21dc172ad3c0dcd98a88b7f8c32e451..1b2ec8e0f6ed6ce67025dfe1fc6fcb2cf9c4250e 100644
--- a/third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h
+++ b/third_party/WebKit/Source/core/css/resolver/CSSPropertyPriority.h
@@ -15,6 +15,7 @@ namespace blink {
 // decides the pixel value of low priority properties with 'em' units.
 
 enum CSSPropertyPriority {
+    ResolveVariables,
     HighPropertyPriority,
     LowPropertyPriority
 };
@@ -32,6 +33,19 @@ public:
 };
 
 template<>
+inline CSSPropertyID CSSPropertyPriorityData<ResolveVariables>::first()
+{
+    static_assert(CSSPropertyVariable == firstCSSProperty - 1, "CSSPropertyVariable should be directly before the first CSS property.");
+    return CSSPropertyVariable;
+}
+
+template<>
+inline CSSPropertyID CSSPropertyPriorityData<ResolveVariables>::last()
+{
+    return CSSPropertyVariable;
+}
+
+template<>
 inline CSSPropertyID CSSPropertyPriorityData<HighPropertyPriority>::first()
 {
     static_assert(CSSPropertyColor == firstCSSProperty, "CSSPropertyColor should be the first high priority property");