Add nested SkPictureImageFilters to the GPU veto.

include/effects/SkPictureImageFilter.h

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureImageFilter_DEFINED
 #define SkPictureImageFilter_DEFINED
 
@@ skipping 51 matching lines @@
 
     /*  Constructs an SkPictureImageFilter object from an SkReadBuffer.
      *  Note: If the SkPictureImageFilter object construction requires bitmap
      *  decoding, the decoder must be set on the SkReadBuffer parameter by calling
      *  SkReadBuffer::setBitmapDecoder() before calling this constructor.
      *  @param SkReadBuffer Serialized picture data.
      */
     void flatten(SkWriteBuffer&) const override;
     sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
                                         SkIPoint* offset) const override;
+    int numSlowPaths() const override;
 
 private:
     explicit SkPictureImageFilter(sk_sp<SkPicture> picture);
     SkPictureImageFilter(sk_sp<SkPicture> picture, const SkRect& cropRect,
                          PictureResolution, SkFilterQuality);
 
     void drawPictureAtDeviceResolution(SkCanvas* canvas,
                                        const SkIRect& deviceBounds,
                                        const Context&) const;
     void drawPictureAtLocalResolution(SkSpecialImage* source,
                                       SkCanvas*,
                                       const SkIRect& deviceBounds,
                                       const Context&) const;
 
     sk_sp<SkPicture>      fPicture;
     SkRect                fCropRect;
     PictureResolution     fPictureResolution;
     SkFilterQuality       fFilterQuality;
 
     typedef SkImageFilter INHERITED;
 };
 
 #endif