Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/core/SkPictureShader.cpp

Index: src/core/SkPictureShader.cpp
diff --git a/src/core/SkPictureShader.cpp b/src/core/SkPictureShader.cpp
index 5fded935cccb8728d776a348ef3326d1d66ccd9a..1f32a7ecdfd5c8a99b0e39046c10756b600213b0 100644
--- a/src/core/SkPictureShader.cpp
+++ b/src/core/SkPictureShader.cpp
@@ -100,6 +100,15 @@
     , fTmy(tmy) {
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkPictureShader::SkPictureShader(SkReadBuffer& buffer) : INHERITED(buffer) {
+    fTmx = static_cast<SkShader::TileMode>(buffer.read32());
+    fTmy = static_cast<SkShader::TileMode>(buffer.read32());
+    buffer.readRect(&fTile);
+    fPicture = SkPicture::CreateFromBuffer(buffer);
+}
+#endif
+
 SkPictureShader::~SkPictureShader() {
     fPicture->unref();
 }