CSS: Scale support for none

third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
index d5d79074e0a2f54d3ca44debbc5517325df8f476..0311e4d2f9438907fe57c8f07dc7d9cd86680c6a 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -1247,6 +1247,11 @@ PassRefPtr<RotateTransformOperation> StyleBuilderConverter::convertRotate(
 PassRefPtr<ScaleTransformOperation> StyleBuilderConverter::convertScale(
     StyleResolverState& state,
     const CSSValue& value) {
+  if (value.isIdentifierValue()) {
+    DCHECK_EQ(toCSSIdentifierValue(value).getValueID(), CSSValueNone);
+    return nullptr;
+  }
+
   const CSSValueList& list = toCSSValueList(value);
   ASSERT(list.length() <= 3);
   double sx = toCSSPrimitiveValue(list.item(0)).getDoubleValue();