Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/gradients/SkSweepGradient.cpp

Index: src/effects/gradients/SkSweepGradient.cpp
diff --git a/src/effects/gradients/SkSweepGradient.cpp b/src/effects/gradients/SkSweepGradient.cpp
index 163700641c3f46f0b7310deb05ccb7b0a2d0f8bc..d080ec5fde963bcad66a74bee674973cb98dfd6d 100644
--- a/src/effects/gradients/SkSweepGradient.cpp
+++ b/src/effects/gradients/SkSweepGradient.cpp
@@ -40,6 +40,13 @@
     }
     return kSweep_GradientType;
 }
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkSweepGradient::SkSweepGradient(SkReadBuffer& buffer)
+    : INHERITED(buffer),
+      fCenter(buffer.readPoint()) {
+}
+#endif
 
 SkFlattenable* SkSweepGradient::CreateProc(SkReadBuffer& buffer) {
     DescriptorScope desc;
@@ -287,7 +294,7 @@
 bool SkSweepGradient::asFragmentProcessor(GrContext* context, const SkPaint& paint,
                                           const SkMatrix* localMatrix, GrColor* paintColor,
                                           GrFragmentProcessor** effect)  const {
-
+    
     SkMatrix matrix;
     if (!this->getLocalMatrix().invert(&matrix)) {
         return false;
@@ -300,10 +307,10 @@
         matrix.postConcat(inv);
     }
     matrix.postConcat(fPtsToUnit);
-
+    
     *effect = GrSweepGradient::Create(context, *this, matrix);
     *paintColor = SkColor2GrColorJustAlpha(paint.getColor());
-
+    
     return true;
 }