Prototype code that turns any/every flattenable into JSON

tests/ColorFilterTest.cpp

Index: tests/ColorFilterTest.cpp
diff --git a/tests/ColorFilterTest.cpp b/tests/ColorFilterTest.cpp
index cf542db9fa2060233cbb93cb0719b138873ed165..9dfadbbb840b56928783ef773c795337e26b4b57 100644
--- a/tests/ColorFilterTest.cpp
+++ b/tests/ColorFilterTest.cpp
@@ -16,7 +16,7 @@
 #include "Test.h"
 
 static sk_sp<SkColorFilter> reincarnate_colorfilter(SkFlattenable* obj) {
-    SkWriteBuffer wb;
+    SkBinaryWriteBuffer wb;
     wb.writeFlattenable(obj);
 
     size_t size = wb.bytesWritten();