Enable flattening/unflattening with custom unflatten procs

Now flattenables are serialized using a string name, so that
flattenables do not necessarily need to be registered before
serialization.  They just need to override getTypeName().

Allows custom unflatten procs to be set on the SkReadBuffer.
This is optional if the flattenable is registered, but otherwise
must be called.

This was split off from:
https://codereview.chromium.org/1837913003/

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1858323002

Review URL: https://codereview.chromium.org/1858323002

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/SkFlattenableSerialization.cpp b/src/core/SkFlattenableSerialization.cpp
index e9ce09ff1f..06e8c10706 100644
--- a/src/core/SkFlattenableSerialization.cpp
+++ b/src/core/SkFlattenableSerialization.cpp
@@ -12,7 +12,7 @@
 #include "SkWriteBuffer.h"
 
 SkData* SkValidatingSerializeFlattenable(SkFlattenable* flattenable) {
-    SkWriteBuffer writer(SkWriteBuffer::kValidation_Flag);
+    SkWriteBuffer writer;
     writer.writeFlattenable(flattenable);
     size_t size = writer.bytesWritten();
     auto data = SkData::MakeUninitialized(size);