force readbuffer clients to use specialized readFoo for flattenables

src/core/SkFlattenableSerialization.cpp

Index: src/core/SkFlattenableSerialization.cpp
diff --git a/src/core/SkFlattenableSerialization.cpp b/src/core/SkFlattenableSerialization.cpp
index b74c82f051648f77dce5da97b26e21ba53b12e4b..cda3182835656c01a70970c3a34a919c3469bfb2 100644
--- a/src/core/SkFlattenableSerialization.cpp
+++ b/src/core/SkFlattenableSerialization.cpp
@@ -9,6 +9,7 @@
 
 #include "SkData.h"
 #include "SkFlattenable.h"
+#include "SkImageFilter.h"
 #include "SkOrderedReadBuffer.h"
 #include "SkOrderedWriteBuffer.h"
 
@@ -22,7 +23,9 @@ SkData* SkSerializeFlattenable(SkFlattenable* flattenable) {
     return SkData::NewFromMalloc(data, size);
 }
 
+// TODO: this guy should be renamed to ImageFilter, or take SkEffectType as
+// a parameter.
 SkFlattenable* SkDeserializeFlattenable(const void* data, size_t size) {
     SkOrderedReadBuffer buffer(data, size);
-    return buffer.readFlattenable();
+    return buffer.readImageFilter();
 }