Fixing SkPicture serialization

include/core/SkReadBuffer.h

Index: include/core/SkReadBuffer.h
diff --git a/include/core/SkReadBuffer.h b/include/core/SkReadBuffer.h
index 75cc64b2be190e68720fd5e19709bc0d762efb50..dd3301ec133b9ccd9c188467a0d9bdf077fe7f65 100644
--- a/include/core/SkReadBuffer.h
+++ b/include/core/SkReadBuffer.h
@@ -177,12 +177,14 @@ public:
     virtual bool isValid() const { return true; }
     virtual bool validateAvailable(size_t size) { return true; }
 
+protected:
+    SkReader32 fReader;
+
 private:
     bool readArray(void* value, size_t size, size_t elementSize);
 
     uint32_t fFlags;
 
-    SkReader32 fReader;
     void* fMemoryPtr;
 
     SkBitmapHeapReader* fBitmapStorage;