Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

gm/imagefiltersgraph.cpp

Index: gm/imagefiltersgraph.cpp
diff --git a/gm/imagefiltersgraph.cpp b/gm/imagefiltersgraph.cpp
index 8469a43b59e824d52d02d29a377c9edb59ed3149..8af268e5681a9777e77fc6cf1a4f5803b07bf80c 100644
--- a/gm/imagefiltersgraph.cpp
+++ b/gm/imagefiltersgraph.cpp
@@ -29,7 +29,11 @@
     public:
         Registrar() {
             SkFlattenable::Register("SimpleOffsetFilter",
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+                                    SimpleOffsetFilter::DeepCreateProc,
+#else
                                     SimpleOffsetFilter::CreateProc,
+#endif
                                     SimpleOffsetFilter::GetFlattenableType());
         }
     };
@@ -65,6 +69,14 @@
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SimpleOffsetFilter);
 
 protected:
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+    explicit SimpleOffsetFilter(SkReadBuffer& buffer)
+    : SkImageFilter(1, buffer) {
+        fDX = buffer.readScalar();
+        fDY = buffer.readScalar();
+    }
+#endif
+
     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         this->INHERITED::flatten(buffer);
         buffer.writeScalar(fDX);