Implement an SkPicture image filter source. This is required for the external-SVG reference feature…

gm/pictureimagefilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "SkPictureImageFilter.h"
@@ skipping 54 matching lines @@
             // Draw an unscaled subset of the source picture.
             fillRectFiltered(canvas, bounds, pictureSourceSrcRect);
             canvas->translate(SkIntToScalar(100), 0);
 
             // Draw the picture to an empty rect (should draw nothing).
             fillRectFiltered(canvas, bounds, pictureSourceEmptyRect);
             canvas->translate(SkIntToScalar(100), 0);
         }
     }
 
+    // SkPictureImageFilter doesn't support serialization yet.
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return kSkipPicture_Flag            |
+               kSkipPipe_Flag               |
+               kSkipPipeCrossProcess_Flag   |
+               kSkipTiled_Flag              |
+               kSkipScaledReplay_Flag;
+    }
+
 private:
     SkPicture fPicture;
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new PictureImageFilterGM; )