Web Animations API: Implement step-middle and steps(x, middle) timing functions.

Source/core/css/CSSTimingFunctionValue.h

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 #ifndef CSSTimingFunctionValue_h
 #define CSSTimingFunctionValue_h
 
 #include "core/css/CSSValue.h"
+#include "platform/animation/TimingFunction.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class CSSCubicBezierTimingFunctionValue : public CSSValue {
 public:
     static PassRefPtr<CSSCubicBezierTimingFunctionValue> create(double x1, double y1, double x2, double y2)
     {
         return adoptRef(new CSSCubicBezierTimingFunctionValue(x1, y1, x2, y2));
     }
@@ skipping 20 matching lines @@
     double m_x1;
     double m_y1;
     double m_x2;
     double m_y2;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCubicBezierTimingFunctionValue, isCubicBezierTimingFunctionValue());
 
 class CSSStepsTimingFunctionValue : public CSSValue {
 public:
-    static PassRefPtr<CSSStepsTimingFunctionValue> create(int steps, bool stepAtStart)
+    static PassRefPtr<CSSStepsTimingFunctionValue> create(int steps, StepsTimingFunction::StepAtPosition stepAtPosition)
     {
-        return adoptRef(new CSSStepsTimingFunctionValue(steps, stepAtStart));
+        return adoptRef(new CSSStepsTimingFunctionValue(steps, stepAtPosition));
     }
 
     int numberOfSteps() const { return m_steps; }
-    bool stepAtStart() const { return m_stepAtStart; }
+    StepsTimingFunction::StepAtPosition stepAtPosition() const { return m_stepAtPosition; }
 
     String customCSSText() const;
 
     bool equals(const CSSStepsTimingFunctionValue&) const;
 
 private:
-    CSSStepsTimingFunctionValue(int steps, bool stepAtStart)
+    CSSStepsTimingFunctionValue(int steps, StepsTimingFunction::StepAtPosition stepAtPosition)
         : CSSValue(StepsTimingFunctionClass)
         , m_steps(steps)
-        , m_stepAtStart(stepAtStart)
+        , m_stepAtPosition(stepAtPosition)
     {
     }
 
     int m_steps;
-    bool m_stepAtStart;
+    StepsTimingFunction::StepAtPosition m_stepAtPosition;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSStepsTimingFunctionValue, isStepsTimingFunctionValue());
 
 } // namespace
 
 #endif