cc: Replace the WebCore::UnitBezier class with the SkUnitCubicInterp() method from Skia.

cc/timing_function.h

 // Copyright 2012 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 CC_TIMING_FUNCTION_H_
 #define CC_TIMING_FUNCTION_H_
 
-#include "UnitBezier.h"
 #include "cc/animation_curve.h"
 #include "cc/cc_export.h"
+#include "third_party/skia/include/core/SkScalar.h"
 
 namespace cc {
 
 // See http://www.w3.org/TR/css3-transitions/.
 class CC_EXPORT TimingFunction : public FloatAnimationCurve {
 public:
     virtual ~TimingFunction();
 
     // Partial implementation of FloatAnimationCurve.
     virtual double duration() const OVERRIDE;
 
 protected:
     TimingFunction();
 };
 
 class CC_EXPORT CubicBezierTimingFunction : public TimingFunction {
 public:
     static scoped_ptr<CubicBezierTimingFunction> create(double x1, double y1, double x2, double y2);
     virtual ~CubicBezierTimingFunction();
 
     // Partial implementation of FloatAnimationCurve.
     virtual float getValue(double time) const OVERRIDE;
     virtual scoped_ptr<AnimationCurve> clone() const OVERRIDE;
 
 protected:
     CubicBezierTimingFunction(double x1, double y1, double x2, double y2);
 
-    UnitBezier m_curve;
+    SkScalar m_x1;
+    SkScalar m_y1;
+    SkScalar m_x2;
+    SkScalar m_y2;
 };
 
 class CC_EXPORT EaseTimingFunction {
 public:
     static scoped_ptr<TimingFunction> create();
 };
 
 class CC_EXPORT EaseInTimingFunction {
 public:
     static scoped_ptr<TimingFunction> create();
 };
 
 class CC_EXPORT EaseOutTimingFunction {
 public:
     static scoped_ptr<TimingFunction> create();
 };
 
 class CC_EXPORT EaseInOutTimingFunction {
 public:
     static scoped_ptr<TimingFunction> create();
 };
 
 } // namespace cc
 
 #endif  // CC_TIMING_FUNCTION_H_