Add forEach() to CSSVariablesMap

Source/core/css/CSSVariablesMap.cpp

Index: Source/core/css/CSSVariablesMap.cpp
diff --git a/Source/core/css/CSSVariablesMap.cpp b/Source/core/css/CSSVariablesMap.cpp
index 599a9dca63968fd571a71c0b2611833ad770ba76..4345d53e439c52ddd744d850dd0255328a87e7cb 100644
--- a/Source/core/css/CSSVariablesMap.cpp
+++ b/Source/core/css/CSSVariablesMap.cpp
@@ -74,4 +74,30 @@ void CSSVariablesMap::clear(ExceptionState& es) const
         return m_styleDeclaration->clearVariables(es);
 }
 
+void CSSVariablesMap::forEach(PassRefPtr<CSSVariablesMapForEachCallback> callback, ScriptValue* thisArg) const
+{
+    if (!m_styleDeclaration)
+        return;
+    RefPtr<CSSVariablesIterator> iterator = m_styleDeclaration->variablesIterator();
+    while (!iterator->atEnd()) {
+        String name = iterator->name();
+        String value = iterator->value();
+        if (thisArg)
+            callback->handleItem(*thisArg, value, name, const_cast<CSSVariablesMap*>(this));
+        else
+            callback->handleItem(value, name, const_cast<CSSVariablesMap*>(this));
+        iterator->advance();
+    }
+}
+
+void CSSVariablesMap::forEach(PassRefPtr<CSSVariablesMapForEachCallback> callback, ScriptValue thisArg) const
+{
+    forEach(callback, &thisArg);
+}
+
+void CSSVariablesMap::forEach(PassRefPtr<CSSVariablesMapForEachCallback> callback) const
+{
+    forEach(callback, 0);
+}
+
 } // namespace WebCore