Simplify flattening to just write enough to call the factory

src/effects/SkTileImageFilter.cpp

Index: src/effects/SkTileImageFilter.cpp
diff --git a/src/effects/SkTileImageFilter.cpp b/src/effects/SkTileImageFilter.cpp
index 73c0a581e98e5ae57c7e3cbcd7c92195a6d33a4c..df5495f51ff5d99d180dc85e630a2f72054a987c 100644
--- a/src/effects/SkTileImageFilter.cpp
+++ b/src/effects/SkTileImageFilter.cpp
@@ -86,12 +86,22 @@ bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
     return true;
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
 SkTileImageFilter::SkTileImageFilter(SkReadBuffer& buffer)
   : INHERITED(1, buffer) {
     buffer.readRect(&fSrcRect);
     buffer.readRect(&fDstRect);
     buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
 }
+#endif
+
+SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) {
+    SK_IMAGEFILTER_UNFLATTEN_COMMON(1);
+    SkRect src, dst;
+    buffer.readRect(&src);
+    buffer.readRect(&dst);
+    return Create(src, dst, common.inputAt(0));
+}
 
 void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);