Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/gradients/SkTwoPointConicalGradient.cpp

Index: src/effects/gradients/SkTwoPointConicalGradient.cpp
diff --git a/src/effects/gradients/SkTwoPointConicalGradient.cpp b/src/effects/gradients/SkTwoPointConicalGradient.cpp
index 2fc848e10962a86a4bd7dbd2a7644b9308306f4a..5410f6a9dfaed46a03025801a25cf25bdf8a5c76 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -343,6 +343,19 @@
     return kConical_GradientType;
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkTwoPointConicalGradient::SkTwoPointConicalGradient(
+    SkReadBuffer& buffer)
+    : INHERITED(buffer)
+    , fCenter1(buffer.readPoint())
+    , fCenter2(buffer.readPoint())
+    , fRadius1(buffer.readScalar())
+    , fRadius2(buffer.readScalar())
+    , fFlippedGrad(buffer.readBool()) {
+    this->init();
+}
+#endif
+
 SkFlattenable* SkTwoPointConicalGradient::CreateProc(SkReadBuffer& buffer) {
     DescriptorScope desc;
     if (!desc.unflatten(buffer)) {