Initial error handling code

include/core/SkFlattenableBuffers.h

Index: include/core/SkFlattenableBuffers.h
diff --git a/include/core/SkFlattenableBuffers.h b/include/core/SkFlattenableBuffers.h
index 03c03f3877e6f8e3f508d29e371d5c7ebd91624e..ef080cf5c374805291a8018ccac535f484a5545d 100644
--- a/include/core/SkFlattenableBuffers.h
+++ b/include/core/SkFlattenableBuffers.h
@@ -10,6 +10,7 @@
 #define SkFlattenableBuffers_DEFINED
 
 #include "SkColor.h"
+#include "SkError.h"
 #include "SkPaint.h"
 #include "SkPoint.h"
 
@@ -102,6 +103,13 @@ public:
         return static_cast<T*>(this->readFlattenable());
     }
 
+    void setError(SkError error) {
+        fError = static_cast<SkError>(fError | error);
+    }
+
+protected:
+    SkError fError;
+
 private:
     uint32_t fFlags;
 };