Gradients are serialized (and can be constructed) as SkColor4f + SkColorSpace

include/effects/SkGradientShader.h

Index: include/effects/SkGradientShader.h
diff --git a/include/effects/SkGradientShader.h b/include/effects/SkGradientShader.h
index 6b86f441eb7b4889d905620e395f58c2609cbe07..2fcce75c30ecfcedf29caeb40ccfc3a63b4d22d0 100644
--- a/include/effects/SkGradientShader.h
+++ b/include/effects/SkGradientShader.h
@@ -48,6 +48,28 @@ public:
         return MakeLinear(pts, colors, pos, count, mode, 0, NULL);
     }
 
+    /** Returns a shader that generates a linear gradient between the two specified points.
+        <p />
+        @param  pts     The start and end points for the gradient.
+        @param  colors  The array[count] of colors, to be distributed between the two points
+        @param  pos     May be NULL. array[count] of SkScalars, or NULL, of the relative position of
+                        each corresponding color in the colors array. If this is NULL,
+                        the the colors are distributed evenly between the start and end point.
+                        If this is not null, the values must begin with 0, end with 1.0, and
+                        intermediate values must be strictly increasing.
+        @param  count   Must be >=2. The number of colors (and pos if not NULL) entries.
+        @param  mode    The tiling mode
+    */
+    static sk_sp<SkShader> MakeLinear(const SkPoint pts[2],
+                                      const SkColor4f colors[], sk_sp<SkColorSpace> colorSpace,
+                                      const SkScalar pos[], int count, SkShader::TileMode mode,
+                                      uint32_t flags, const SkMatrix* localMatrix);
+    static sk_sp<SkShader> MakeLinear(const SkPoint pts[2],
+                                      const SkColor4f colors[], sk_sp<SkColorSpace> colorSpace,
+                                      const SkScalar pos[], int count, SkShader::TileMode mode) {
+        return MakeLinear(pts, colors, std::move(colorSpace), pos, count, mode, 0, NULL);
+    }
+
     /** Returns a shader that generates a radial gradient given the center and radius.
         <p />
         @param  center  The center of the circle for this gradient
@@ -71,6 +93,29 @@ public:
         return MakeRadial(center, radius, colors, pos, count, mode, 0, NULL);
     }
 
+    /** Returns a shader that generates a radial gradient given the center and radius.
+        <p />
+        @param  center  The center of the circle for this gradient
+        @param  radius  Must be positive. The radius of the circle for this gradient
+        @param  colors  The array[count] of colors, to be distributed between the center and edge of the circle
+        @param  pos     May be NULL. The array[count] of SkScalars, or NULL, of the relative position of
+                        each corresponding color in the colors array. If this is NULL,
+                        the the colors are distributed evenly between the center and edge of the circle.
+                        If this is not null, the values must begin with 0, end with 1.0, and
+                        intermediate values must be strictly increasing.
+        @param  count   Must be >= 2. The number of colors (and pos if not NULL) entries
+        @param  mode    The tiling mode
+    */
+    static sk_sp<SkShader> MakeRadial(const SkPoint& center, SkScalar radius,
+                                      const SkColor4f colors[], sk_sp<SkColorSpace> colorSpace,
+                                      const SkScalar pos[], int count, SkShader::TileMode mode,
+                                      uint32_t flags, const SkMatrix* localMatrix);
+    static sk_sp<SkShader> MakeRadial(const SkPoint& center, SkScalar radius,
+                                      const SkColor4f colors[], sk_sp<SkColorSpace> colorSpace,
+                                      const SkScalar pos[], int count, SkShader::TileMode mode) {
+        return MakeRadial(center, radius, colors, std::move(colorSpace), pos, count, mode, 0, NULL);
+    }
+
     /**
      *  Returns a shader that generates a conical gradient given two circles, or
      *  returns NULL if the inputs are invalid. The gradient interprets the
@@ -90,6 +135,27 @@ public:
                                    0, NULL);
     }
 
+    /**
+     *  Returns a shader that generates a conical gradient given two circles, or
+     *  returns NULL if the inputs are invalid. The gradient interprets the
+     *  two circles according to the following HTML spec.
+     *  http://dev.w3.org/html5/2dcontext/#dom-context-2d-createradialgradient
+     */
+    static sk_sp<SkShader> MakeTwoPointConical(const SkPoint& start, SkScalar startRadius,
+                                               const SkPoint& end, SkScalar endRadius,
+                                               const SkColor4f colors[],
+                                               sk_sp<SkColorSpace> colorSpace, const SkScalar pos[],
+                                               int count, SkShader::TileMode mode,
+                                               uint32_t flags, const SkMatrix* localMatrix);
+    static sk_sp<SkShader> MakeTwoPointConical(const SkPoint& start, SkScalar startRadius,
+                                               const SkPoint& end, SkScalar endRadius,
+                                               const SkColor4f colors[],
+                                               sk_sp<SkColorSpace> colorSpace, const SkScalar pos[],
+                                               int count, SkShader::TileMode mode) {
+        return MakeTwoPointConical(start, startRadius, end, endRadius, colors,
+                                   std::move(colorSpace), pos, count, mode, 0, NULL);
+    }
+
     /** Returns a shader that generates a sweep gradient given a center.
         <p />
         @param  cx      The X coordinate of the center of the sweep
@@ -110,6 +176,28 @@ public:
         return MakeSweep(cx, cy, colors, pos, count, 0, NULL);
     }
 
+    /** Returns a shader that generates a sweep gradient given a center.
+        <p />
+        @param  cx      The X coordinate of the center of the sweep
+        @param  cx      The Y coordinate of the center of the sweep
+        @param  colors  The array[count] of colors, to be distributed around the center.
+        @param  pos     May be NULL. The array[count] of SkScalars, or NULL, of the relative position of
+                        each corresponding color in the colors array. If this is NULL,
+                        the the colors are distributed evenly between the center and edge of the circle.
+                        If this is not null, the values must begin with 0, end with 1.0, and
+                        intermediate values must be strictly increasing.
+        @param  count   Must be >= 2. The number of colors (and pos if not NULL) entries
+    */
+    static sk_sp<SkShader> MakeSweep(SkScalar cx, SkScalar cy,
+                                     const SkColor4f colors[], sk_sp<SkColorSpace> colorSpace,
+                                     const SkScalar pos[], int count,
+                                     uint32_t flags, const SkMatrix* localMatrix);
+    static sk_sp<SkShader> MakeSweep(SkScalar cx, SkScalar cy,
+                                     const SkColor4f colors[], sk_sp<SkColorSpace> colorSpace,
+                                     const SkScalar pos[], int count) {
+        return MakeSweep(cx, cy, colors, std::move(colorSpace), pos, count, 0, NULL);
+    }
+
 #ifdef SK_SUPPORT_LEGACY_CREATESHADER_PTR
     static SkShader* CreateLinear(const SkPoint pts[2],
                                   const SkColor colors[], const SkScalar pos[], int count,