Make SkSpecialSurfaces always use kUnknown for their pixel geometry

src/effects/SkPictureImageFilter.cpp

 /*
  * 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.
  */
 
 #include "SkPictureImageFilter.h"
 
 #include "SkCanvas.h"
@@ skipping 90 matching lines @@
     sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
     if (!surf) {
         return nullptr;
     }
 
     SkCanvas* canvas = surf->getCanvas();
     SkASSERT(canvas);
 
     canvas->clear(0x0);
 
-    if (kDeviceSpace_PictureResolution == fPictureResolution || 
+    if (kDeviceSpace_PictureResolution == fPictureResolution ||
         0 == (ctx.ctm().getType() & ~SkMatrix::kTranslate_Mask)) {
-        this->drawPictureAtDeviceResolution(canvas, bounds, ctx);        
+        this->drawPictureAtDeviceResolution(canvas, bounds, ctx);
     } else {
         this->drawPictureAtLocalResolution(source, canvas, bounds, ctx);
     }
 
     offset->fX = bounds.fLeft;
     offset->fY = bounds.fTop;
     return surf->makeImageSnapshot();
 }
 
 void SkPictureImageFilter::drawPictureAtDeviceResolution(SkCanvas* canvas,
@@ skipping 60 matching lines @@
     str->appendf("crop: (%f,%f,%f,%f) ",
                  fCropRect.fLeft, fCropRect.fTop, fCropRect.fRight, fCropRect.fBottom);
     if (fPicture) {
         str->appendf("picture: (%f,%f,%f,%f)",
                      fPicture->cullRect().fLeft, fPicture->cullRect().fTop,
                      fPicture->cullRect().fRight, fPicture->cullRect().fBottom);
     }
     str->append(")");
 }
 #endif