CSS Custom Properties (Variables)

Source/core/css/StylePropertySet.cpp

Index: Source/core/css/StylePropertySet.cpp
diff --git a/Source/core/css/StylePropertySet.cpp b/Source/core/css/StylePropertySet.cpp
index d0da61710b52cdd6d624c5a5fc789e20ce727e02..8a2bf7238045fbb7ad893fbaf7db79c7e68cf8cc 100644
--- a/Source/core/css/StylePropertySet.cpp
+++ b/Source/core/css/StylePropertySet.cpp
@@ -517,6 +517,17 @@ int MutableStylePropertySet::findPropertyIndex(CSSPropertyID propertyID) const
     return -1;
 }
 
+unsigned StylePropertySet::variableCount() const
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    unsigned count = 0;
+    for (unsigned i = 0; i < propertyCount(); ++i) {
+        if (propertyAt(i).id() == CSSPropertyVariable)
+            count++;
+    }
+    return count;
+}
+
 DEFINE_TRACE_AFTER_DISPATCH(MutableStylePropertySet)
 {
 #if ENABLE(OILPAN)