Simplify flattening to just write enough to call the factory

src/effects/SkEmbossMaskFilter.cpp

Index: src/effects/SkEmbossMaskFilter.cpp
diff --git a/src/effects/SkEmbossMaskFilter.cpp b/src/effects/SkEmbossMaskFilter.cpp
index cdd55fcc5b836e00328e6fba0aca41ac50097f56..4841b92816459ccd9c61b7e413d0b885cdeb38a1 100644
--- a/src/effects/SkEmbossMaskFilter.cpp
+++ b/src/effects/SkEmbossMaskFilter.cpp
@@ -124,17 +124,26 @@ bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src,
     return true;
 }
 
-SkEmbossMaskFilter::SkEmbossMaskFilter(SkReadBuffer& buffer)
-        : SkMaskFilter(buffer) {
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkEmbossMaskFilter::SkEmbossMaskFilter(SkReadBuffer& buffer) : SkMaskFilter(buffer) {
     SkASSERT(buffer.getArrayCount() == sizeof(Light));
     buffer.readByteArray(&fLight, sizeof(Light));
     SkASSERT(fLight.fPad == 0); // for the font-cache lookup to be clean
     fBlurSigma = buffer.readScalar();
 }
+#endif
 
-void SkEmbossMaskFilter::flatten(SkWriteBuffer& buffer) const {
-    this->INHERITED::flatten(buffer);
+SkFlattenable* SkEmbossMaskFilter::CreateProc(SkReadBuffer& buffer) {
+    Light light;
+    if (buffer.readByteArray(&light, sizeof(Light))) {
+        light.fPad = 0; // for the font-cache lookup to be clean
+        const SkScalar sigma = buffer.readScalar();
+        return Create(sigma, light);
+    }
+    return NULL;
+}
 
+void SkEmbossMaskFilter::flatten(SkWriteBuffer& buffer) const {
     Light tmpLight = fLight;
     tmpLight.fPad = 0;    // for the font-cache lookup to be clean
     buffer.writeByteArray(&tmpLight, sizeof(tmpLight));