Add support for unprefixed CSS Transforms

Source/core/css/resolver/StyleAdjuster.cpp

Index: Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/Source/core/css/resolver/StyleAdjuster.cpp b/Source/core/css/resolver/StyleAdjuster.cpp
index 47fd83541774507e96858d18e08d86f966806203..4d1ba901d41428d7bf71647f35932bc748b48b32 100644
--- a/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/Source/core/css/resolver/StyleAdjuster.cpp
@@ -166,8 +166,11 @@ static bool hasWillChangeThatCreatesStackingContext(const RenderStyle* style, El
     for (size_t i = 0; i < style->willChangeProperties().size(); ++i) {
         switch (style->willChangeProperties()[i]) {
         case CSSPropertyOpacity:
+        case CSSPropertyTransform:
         case CSSPropertyWebkitTransform:
+        case CSSPropertyTransformStyle:
         case CSSPropertyWebkitTransformStyle:
+        case CSSPropertyPerspective:
         case CSSPropertyWebkitPerspective:
         case CSSPropertyWebkitMask:
         case CSSPropertyWebkitMaskBoxImage:
@@ -236,7 +239,7 @@ void StyleAdjuster::adjustRenderStyle(RenderStyle* style, RenderStyle* parentSty
 
     // will-change:transform should result in the same rendering behavior as having a transform,
     // including the creation of a containing block for fixed position descendants.
-    if (!style->hasTransform() && style->willChangeProperties().contains(CSSPropertyWebkitTransform)) {
+    if (!style->hasTransform() && (style->willChangeProperties().contains(CSSPropertyWebkitTransform) || style->willChangeProperties().contains(CSSPropertyTransform))) {
         bool makeIdentity = true;
         style->setTransform(TransformOperations(makeIdentity));
     }