Introduce CSS_VALUE_TYPE_CASTS macro to cast CSSValue

Source/core/css/resolver/StyleBuilderCustom.cpp

Index: Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/Source/core/css/resolver/StyleBuilderCustom.cpp b/Source/core/css/resolver/StyleBuilderCustom.cpp
index 5f05ecab84573eaa7d0790d05d56398218822741..26e457f31baf2d55418a1b65730240a637142d32 100644
--- a/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -1211,7 +1211,7 @@ static bool hasVariableReference(CSSValue* value)
         return static_cast<CSSCalcValue*>(value)->hasVariableReference();
 
     if (value->isReflectValue()) {
-        CSSReflectValue* reflectValue = static_cast<CSSReflectValue*>(value);
+        CSSReflectValue* reflectValue = toCSSReflectValue(value);
         CSSPrimitiveValue* direction = reflectValue->direction();
         CSSPrimitiveValue* offset = reflectValue->offset();
         CSSValue* mask = reflectValue->mask();
@@ -1332,7 +1332,7 @@ void StyleBuilder::oldApplyProperty(CSSPropertyID id, StyleResolverState& state,
                         state.style()->setContent(StyleGeneratedImage::create(static_cast<CSSImageGeneratorValue*>(item)), didSet);
                     didSet = true;
                 } else if (item->isImageSetValue()) {
-                    state.style()->setContent(state.elementStyleResources().setOrPendingFromValue(CSSPropertyContent, static_cast<CSSImageSetValue*>(item)), didSet);
+                    state.style()->setContent(state.elementStyleResources().setOrPendingFromValue(CSSPropertyContent, toCSSImageSetValue(item)), didSet);
                     didSet = true;
                 }
 
@@ -1534,7 +1534,7 @@ void StyleBuilder::oldApplyProperty(CSSPropertyID id, StyleResolverState& state,
         if (!value->isReflectValue())
             return;
 
-        CSSReflectValue* reflectValue = static_cast<CSSReflectValue*>(value);
+        CSSReflectValue* reflectValue = toCSSReflectValue(value);
         RefPtr<StyleReflection> reflection = StyleReflection::create();
         reflection->setDirection(*reflectValue->direction());
         if (reflectValue->offset())