Add support for repeating-conic-gradient()

third_party/WebKit/Source/platform/graphics/Gradient.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * 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
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 241 matching lines @@
   const FloatPoint m_p1;
   const float m_r0;
   const float m_r1;
   const float m_aspectRatio;  // For elliptical gradient, width / height.
 };
 
 class ConicGradient final : public Gradient {
  public:
   ConicGradient(const FloatPoint& position,
                 float angle,
-                GradientSpreadMethod spreadMethod,
                 ColorInterpolation interpolation)
-      : Gradient(Type::Conic, spreadMethod, interpolation),
+      : Gradient(Type::Conic, SpreadMethodPad, interpolation),
         m_position(position),
         m_angle(angle) {}
 
  protected:
   sk_sp<SkShader> createShader(const ColorBuffer& colors,
                                const OffsetBuffer& pos,
                                SkShader::TileMode tileMode,
                                uint32_t flags,
                                const SkMatrix& localMatrix) const override {
-    if (tileMode != SkShader::kClamp_TileMode) {
-      // TODO(fmalita): kRepeat support
-      return nullptr;
-    }
+    DCHECK_NE(tileMode, SkShader::kMirror_TileMode);
 
     // Skia's sweep gradient angles are relative to the x-axis, not the y-axis.
     const float skiaAngle = m_angle - 90;
     SkTCopyOnFirstWrite<SkMatrix> adjustedLocalMatrix(localMatrix);
     if (skiaAngle) {
       adjustedLocalMatrix.writable()->preRotate(skiaAngle, m_position.x(),
                                                 m_position.y());
     }
 
     return SkGradientShader::MakeSweep(
@@ skipping 21 matching lines @@
                                             float r1,
                                             float aspectRatio,
                                             GradientSpreadMethod spreadMethod,
                                             ColorInterpolation interpolation) {
   return adoptRef(new RadialGradient(p0, r0, p1, r1, aspectRatio, spreadMethod,
                                      interpolation));
 }
 
 PassRefPtr<Gradient> Gradient::createConic(const FloatPoint& position,
                                            float angle,
-                                           GradientSpreadMethod spreadMethod,
                                            ColorInterpolation interpolation) {
-  return adoptRef(
-      new ConicGradient(position, angle, spreadMethod, interpolation));
+  return adoptRef(new ConicGradient(position, angle, interpolation));
 }
 
 }  // namespace blink