Generate toCSSFooValue() for CSSCanvasValue, CSSCrossfadeValue, CSSImageGeneratorValue, CSSImageVal…

Source/core/css/CSSTimingFunctionValue.h

 /*
  * Copyright (C) 2007, 2008, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 45 matching lines @@
         , m_y2(y2)
     {
     }
 
     double m_x1;
     double m_y1;
     double m_x2;
     double m_y2;
 };
 
+DEFINE_CSS_VALUE_TYPE_CASTS(CubicBezierTimingFunctionValue);
+
 class CSSStepsTimingFunctionValue : public CSSValue {
 public:
     static PassRefPtr<CSSStepsTimingFunctionValue> create(int steps, bool stepAtStart)
     {
         return adoptRef(new CSSStepsTimingFunctionValue(steps, stepAtStart));
     }
 
     int numberOfSteps() const { return m_steps; }
     bool stepAtStart() const { return m_stepAtStart; }
 
     String customCssText() const;
 
     bool equals(const CSSStepsTimingFunctionValue&) const;
 
 private:
     CSSStepsTimingFunctionValue(int steps, bool stepAtStart)
         : CSSValue(StepsTimingFunctionClass)
         , m_steps(steps)
         , m_stepAtStart(stepAtStart)
     {
     }
 
     int m_steps;
     bool m_stepAtStart;
 };
 
+DEFINE_CSS_VALUE_TYPE_CASTS(StepsTimingFunctionValue);
+
 } // namespace
 
 #endif