Simplify flattening to just write enough to call the factory

src/effects/SkRectShaderImageFilter.cpp

Index: src/effects/SkRectShaderImageFilter.cpp
diff --git a/src/effects/SkRectShaderImageFilter.cpp b/src/effects/SkRectShaderImageFilter.cpp
index 6961facc10b4ef359ca1ccb0eba958b8b01a21c7..3548e21b0d6ecbb080e791c7a9021a471277a5af 100644
--- a/src/effects/SkRectShaderImageFilter.cpp
+++ b/src/effects/SkRectShaderImageFilter.cpp
@@ -35,14 +35,23 @@ SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cr
     s->ref();
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
 SkRectShaderImageFilter::SkRectShaderImageFilter(SkReadBuffer& buffer)
   : INHERITED(0, buffer) {
     fShader = buffer.readShader();
 }
+#endif
 
-void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
-    this->INHERITED::flatten(buffer);
+SkFlattenable* SkRectShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
+    Common common;
+    if (!common.unflatten(buffer, 0)) {
+        return NULL;
+    }
+    return Create(buffer.readShader(), &common.cropRect());
+}
 
+void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
+    this->flattenCommon(buffer);
     buffer.writeFlattenable(fShader);
 }