Fix SkXPSDevice

include/device/xps/SkXPSDevice.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 SkXPSDevice_DEFINED
 #define SkXPSDevice_DEFINED
 
@@ skipping 130 matching lines @@
         const SkDraw&,
         SkBaseDevice* device,
         int x, int y,
         const SkPaint& paint) SK_OVERRIDE;
 
     virtual bool onReadPixels(const SkBitmap& bitmap,
                               int x,
                               int y,
                               SkCanvas::Config8888) SK_OVERRIDE;
 
-    virtual bool allowImageFilter(SkImageFilter*) SK_OVERRIDE;
+    virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE;
 
 private:
     class TypefaceUse : ::SkNoncopyable {
     public:
         SkFontID typefaceId;
         int ttcIndex;
         SkStream* fontData;
         IXpsOMFontResource* xpsFont;
         SkBitSet* glyphsUsed;
 
@@ skipping 157 matching lines @@
                                                    Usage usage) SK_OVERRIDE;
 
     // Disable the default copy and assign implementation.
     SkXPSDevice(const SkXPSDevice&);
     void operator=(const SkXPSDevice&);
 
     typedef SkBitmapDevice INHERITED;
 };
 
 #endif