Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkBlurDrawLooper.cpp

Index: src/effects/SkBlurDrawLooper.cpp
diff --git a/src/effects/SkBlurDrawLooper.cpp b/src/effects/SkBlurDrawLooper.cpp
index b3094d6c45120734cb7d9ce7c5fe95080e81fc86..fc9e47b0b4fa9a2c563af6dfdc11ae74009f0959 100644
--- a/src/effects/SkBlurDrawLooper.cpp
+++ b/src/effects/SkBlurDrawLooper.cpp
@@ -61,6 +61,19 @@
 
     this->initEffects();
 }
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkBlurDrawLooper::SkBlurDrawLooper(SkReadBuffer& buffer) : INHERITED(buffer) {
+
+    fSigma = buffer.readScalar();
+    fDx = buffer.readScalar();
+    fDy = buffer.readScalar();
+    fBlurColor = buffer.readColor();
+    fBlurFlags = buffer.readUInt() & kAll_BlurFlag;
+
+    this->initEffects();
+}
+#endif
 
 SkFlattenable* SkBlurDrawLooper::CreateProc(SkReadBuffer& buffer) {
     const SkColor color = buffer.readColor();