Use DEFINE_CSS_VALUE_TYPE_CASTS() for SVGColor, SVGPaint, and TextCloneCSSValue

Source/core/css/CSSValue.h

Index: Source/core/css/CSSValue.h
diff --git a/Source/core/css/CSSValue.h b/Source/core/css/CSSValue.h
index eac1c2304c52e06cd9a0f03a2b85d716abd04570..76c04cb87585d064aaf2f9f06793a25dd5f8f67c 100644
--- a/Source/core/css/CSSValue.h
+++ b/Source/core/css/CSSValue.h
@@ -89,6 +89,7 @@ public:
     bool isRadialGradientValue() const { return m_classType == RadialGradientClass; }
     bool isReflectValue() const { return m_classType == ReflectClass; }
     bool isShadowValue() const { return m_classType == ShadowClass; }
+    bool isTextCloneCSSValue() const { return m_isTextClone; }
     bool isCubicBezierTimingFunctionValue() const { return m_classType == CubicBezierTimingFunctionClass; }
     bool isStepsTimingFunctionValue() const { return m_classType == StepsTimingFunctionClass; }
     bool isTransformValue() const { return m_classType == CSSTransformClass; }