Add support for unprefixed CSS Transforms

Source/core/css/RuntimeCSSEnabled.cpp

Index: Source/core/css/RuntimeCSSEnabled.cpp
diff --git a/Source/core/css/RuntimeCSSEnabled.cpp b/Source/core/css/RuntimeCSSEnabled.cpp
index 7c39d9e9f39f3f5074b212f308f4427e1907e872..fd9373ad2728fa5215c0bf7be45f7cc5b04cc1b3 100644
--- a/Source/core/css/RuntimeCSSEnabled.cpp
+++ b/Source/core/css/RuntimeCSSEnabled.cpp
@@ -106,6 +106,16 @@ static void setPropertySwitchesFromRuntimeFeatures()
     };
     setCSSPropertiesEnabled(animationProperties, WTF_ARRAY_LENGTH(animationProperties), RuntimeEnabledFeatures::cssAnimationUnprefixedEnabled());
 
+    CSSPropertyID transformProperties[] = {
+        CSSPropertyBackfaceVisibility,
+        CSSPropertyPerspective,
+        CSSPropertyPerspectiveOrigin,
+        CSSPropertyTransform,
+        CSSPropertyTransformOrigin,
+        CSSPropertyTransformStyle
+    };
+    setCSSPropertiesEnabled(transformProperties, WTF_ARRAY_LENGTH(transformProperties), RuntimeEnabledFeatures::cssTransformsUnprefixedEnabled());
+
     RuntimeCSSEnabled::setCSSPropertyEnabled(CSSPropertyMixBlendMode, RuntimeEnabledFeatures::cssCompositingEnabled());
     RuntimeCSSEnabled::setCSSPropertyEnabled(CSSPropertyIsolation, RuntimeEnabledFeatures::cssCompositingEnabled());
     RuntimeCSSEnabled::setCSSPropertyEnabled(CSSPropertyTouchAction, RuntimeEnabledFeatures::cssTouchActionEnabled());