Don't use post multiplication on transforms with compatible pairs of operations

third_party/WebKit/Source/platform/transforms/ScaleTransformOperation.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 47 matching lines @@
                                        double progress,
                                        bool blendToIdentity = false) override;
 
   static bool isMatchingOperationType(OperationType type) {
     return type == Scale || type == ScaleX || type == ScaleY ||
            type == ScaleZ || type == Scale3D;
   }
 
  private:
   OperationType type() const override { return m_type; }
+  OperationType primitiveType() const final { return Scale3D; }
 
   bool operator==(const TransformOperation& o) const override {
     if (!isSameType(o))
       return false;
     const ScaleTransformOperation* s =
         static_cast<const ScaleTransformOperation*>(&o);
     return m_x == s->m_x && m_y == s->m_y && m_z == s->m_z;
   }
 
   PassRefPtr<TransformOperation> zoom(double factor) final { return this; }
 
   ScaleTransformOperation(double sx, double sy, double sz, OperationType type)
       : m_x(sx), m_y(sy), m_z(sz), m_type(type) {
     ASSERT(isMatchingOperationType(type));
   }
 
   double m_x;
   double m_y;
   double m_z;
   OperationType m_type;
 };
 
 DEFINE_TRANSFORM_TYPE_CASTS(ScaleTransformOperation);
 
 }  // namespace blink
 
 #endif  // ScaleTransformOperation_h