Revert of Delete SkFlattenable::Type

src/core/SkReadBuffer.h

Index: src/core/SkReadBuffer.h
diff --git a/src/core/SkReadBuffer.h b/src/core/SkReadBuffer.h
index cd570e18f3b79cb6af420ce0d4808af918d22f7f..7b12194fc03558a70dba98c2b36c4aae2bcf3bbe 100644
--- a/src/core/SkReadBuffer.h
+++ b/src/core/SkReadBuffer.h
@@ -126,9 +126,9 @@
     virtual void readPath(SkPath* path);
     void readPaint(SkPaint* paint) { paint->unflatten(*this); }
 
-    virtual SkFlattenable* readFlattenable();
+    virtual SkFlattenable* readFlattenable(SkFlattenable::Type);
     template <typename T> sk_sp<T> readFlattenable() {
-        return sk_sp<T>((T*)this->readFlattenable());
+        return sk_sp<T>((T*)this->readFlattenable(T::GetFlattenableType()));
     }
     sk_sp<SkColorFilter> readColorFilter() { return this->readFlattenable<SkColorFilter>(); }
     sk_sp<SkDrawLooper> readDrawLooper() { return this->readFlattenable<SkDrawLooper>(); }