Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkBitmapSource.cpp

Index: src/effects/SkBitmapSource.cpp
diff --git a/src/effects/SkBitmapSource.cpp b/src/effects/SkBitmapSource.cpp
index ff76ab4bba71fd314e371ef7163cc736b7b06f15..4da77a9e02de7e196bba833db44f8558694f51cb 100644
--- a/src/effects/SkBitmapSource.cpp
+++ b/src/effects/SkBitmapSource.cpp
@@ -25,6 +25,15 @@
   , fBitmap(bitmap)
   , fSrcRect(srcRect)
   , fDstRect(dstRect) {}
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkBitmapSource::SkBitmapSource(SkReadBuffer& buffer) : INHERITED(0, buffer) {
+    buffer.readBitmap(&fBitmap);
+    buffer.readRect(&fSrcRect);
+    buffer.readRect(&fDstRect);
+    buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
+}
+#endif
 
 SkFlattenable* SkBitmapSource::CreateProc(SkReadBuffer& buffer) {
     SkRect src, dst;