[CSS Typed OM] Refactor is2D handling in CSSTransformComponents to match new spec

third_party/WebKit/Source/core/css/cssom/CSSSkew.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSSkew_h
 #define CSSSkew_h
 
 #include "core/css/cssom/CSSNumericValue.h"
 #include "core/css/cssom/CSSTransformComponent.h"
 
@@ skipping 17 matching lines @@
 
   // Internal ways of creating CSSSkews.
   static CSSSkew* FromCSSValue(const CSSFunctionValue&);
 
   // Getters and setters for the ax and ay attributes defined in the IDL.
   CSSNumericValue* ax() { return ax_.Get(); }
   CSSNumericValue* ay() { return ay_.Get(); }
   void setAx(CSSNumericValue*, ExceptionState&);
   void setAy(CSSNumericValue*, ExceptionState&);
 
+  // From CSSTransformComponent
+  // Setting is2D for CSSSkew does nothing.
+  // https://drafts.css-houdini.org/css-typed-om/#dom-cssskew-is2d
+  void setIs2D(bool is2D) final {}
+
   // Internal methods - from CSSTransformComponent.
   DOMMatrix* AsMatrix() const override;
   TransformComponentType GetType() const override { return kSkewType; }
   CSSFunctionValue* ToCSSValue() const override;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->Trace(ax_);
     visitor->Trace(ay_);
     CSSTransformComponent::Trace(visitor);
   }
 
  private:
   CSSSkew(CSSNumericValue* ax, CSSNumericValue* ay)
-      : CSSTransformComponent(), ax_(ax), ay_(ay) {}
+      : CSSTransformComponent(true /* is2D */), ax_(ax), ay_(ay) {}
 
   Member<CSSNumericValue> ax_;
   Member<CSSNumericValue> ay_;
 };
 
 }  // namespace blink
 
 #endif