Simplify Gradient by holding a Color instead of four floats.

Source/platform/graphics/Gradient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Torch Mobile, Inc.
  * Copyright (C) 2013 Google 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
@@ skipping 13 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Gradient_h
 #define Gradient_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint.h"
+#include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/transforms/AffineTransform.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 class SkShader;
 
 namespace WebCore {
 
-class Color;
 class FloatRect;
 class IntSize;
 
 class PLATFORM_EXPORT Gradient : public RefCounted<Gradient> {
 public:
     static PassRefPtr<Gradient> create(const FloatPoint& p0, const FloatPoint& p1)
     {
         return adoptRef(new Gradient(p0, p1));
     }
     static PassRefPtr<Gradient> create(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio = 1)
     {
         return adoptRef(new Gradient(p0, r0, p1, r1, aspectRatio));
     }
     ~Gradient();
 
     struct ColorStop {
         float stop;
-        float red;
-        float green;
-        float blue;
-        float alpha;
+        Color color;
 
-        ColorStop() : stop(0), red(0), green(0), blue(0), alpha(0) { }
-        ColorStop(float s, float r, float g, float b, float a) : stop(s), red(r), green(g), blue(b), alpha(a) { }
+        ColorStop(float s, const Color& c) : stop(s), color(c) { }
     };
     void addColorStop(const ColorStop&);
     void addColorStop(float, const Color&);
 
     bool hasAlpha() const;
     bool shaderChanged() const { return !m_gradient; }
 
     bool isRadial() const { return m_radial; }
     bool isZeroSize() const { return m_p0.x() == m_p1.x() && m_p0.y() == m_p1.y() && (!m_radial || m_r0 == m_r1); }
 
@@ skipping 68 matching lines @@
     GradientSpreadMethod m_spreadMethod;
     AffineTransform m_gradientSpaceTransformation;
 
 
     RefPtr<SkShader> m_gradient;
 };
 
 } // namespace WebCore
 
 #endif