Simplify flattening to just write enough to call the factory

src/effects/gradients/SkRadialGradient.cpp

Index: src/effects/gradients/SkRadialGradient.cpp
diff --git a/src/effects/gradients/SkRadialGradient.cpp b/src/effects/gradients/SkRadialGradient.cpp
index a6a2e366b22a3f90cfaf7723a061c959b61c820a..fb1d40a7ab0d9c92b66169aca5c785138fbf2a73 100644
--- a/src/effects/gradients/SkRadialGradient.cpp
+++ b/src/effects/gradients/SkRadialGradient.cpp
@@ -252,11 +252,24 @@ SkShader::GradientType SkRadialGradient::asAGradient(GradientInfo* info) const {
     return kRadial_GradientType;
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
 SkRadialGradient::SkRadialGradient(SkReadBuffer& buffer)
     : INHERITED(buffer),
       fCenter(buffer.readPoint()),
       fRadius(buffer.readScalar()) {
 }
+#endif
+
+SkFlattenable* SkRadialGradient::CreateProc(SkReadBuffer& buffer) {
+    DescriptorScope desc;
+    if (!desc.unflatten(buffer)) {
+        return NULL;
+    }
+    const SkPoint center = buffer.readPoint();
+    const SkScalar radius = buffer.readScalar();
+    return SkGradientShader::CreateRadial(center, radius, desc.fColors, desc.fPos, desc.fCount,
+                                          desc.fTileMode, desc.fGradFlags, desc.fLocalMatrix);
+}
 
 void SkRadialGradient::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);