Fixing another clusterfuzz issue

include/core/SkReadBuffer.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkReadBuffer_DEFINED
 #define SkReadBuffer_DEFINED
 
@@ skipping 66 matching lines @@
     }
     bool isScalarFloat() const { return SkToBool(fFlags & kScalarIsFloat_Flag); }
     bool isPtr64Bit() const { return SkToBool(fFlags & kPtrIs64Bit_Flag); }
     bool isValidating() const { return SkToBool(fFlags & kValidation_Flag); }
 
     SkReader32* getReader32() { return &fReader; }
 
     size_t size() { return fReader.size(); }
     size_t offset() { return fReader.offset(); }
     bool eof() { return fReader.eof(); }
-    const void* skip(size_t size) { return fReader.skip(size); }
+    virtual const void* skip(size_t size) { return fReader.skip(size); }
     void* readFunctionPtr() { return fReader.readPtr(); }
 
     // primitives
     virtual bool readBool();
     virtual SkColor readColor();
     virtual SkFixed readFixed();
     virtual int32_t readInt();
     virtual SkScalar readScalar();
     virtual uint32_t readUInt();
     virtual int32_t read32();
@@ skipping 126 matching lines @@
     SkPicture::InstallPixelRefProc fBitmapDecoder;
 
 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT
     // Debugging counter to keep track of how many bitmaps we
     // have decoded.
     int fDecodedBitmapIndex;
 #endif // DEBUG_NON_DETERMINISTIC_ASSERT
 };
 
 #endif // SkReadBuffer_DEFINED