Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkRectShaderImageFilter.cpp

Index: src/effects/SkRectShaderImageFilter.cpp
diff --git a/src/effects/SkRectShaderImageFilter.cpp b/src/effects/SkRectShaderImageFilter.cpp
index 91a127e0e3f2479a866a4211b7333bd221b6570d..09417c8840f9fe8c0ef3ae6cfe1a789ed4064e56 100644
--- a/src/effects/SkRectShaderImageFilter.cpp
+++ b/src/effects/SkRectShaderImageFilter.cpp
@@ -33,6 +33,13 @@
   : INHERITED(0, NULL, cropRect, uniqueID)
   , fShader(SkRef(s)) {
 }
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkRectShaderImageFilter::SkRectShaderImageFilter(SkReadBuffer& buffer)
+  : INHERITED(0, buffer) {
+    fShader = buffer.readShader();
+}
+#endif
 
 SkFlattenable* SkRectShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);