Create special surfaces according to original device (not always in N32)

src/effects/SkDropShadowImageFilter.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 "SkDropShadowImageFilter.h"
 
 #include "SkBlurImageFilter.h"
@@ skipping 59 matching lines @@
         return nullptr;
     }
 
     const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
                                                   input->width(), input->height());
     SkIRect bounds;
     if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
         return nullptr;
     }
 
-    const SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
-                                                  kPremul_SkAlphaType);
-    sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
+    sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
     if (!surf) {
         return nullptr;
     }
 
     SkCanvas* canvas = surf->getCanvas();
     SkASSERT(canvas);
 
     canvas->clear(0x0);
 
     SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
@@ skipping 71 matching lines @@
         "kDrawShadowAndForeground", "kDrawShadowOnly"
     };
 
     static_assert(kShadowModeCount == SK_ARRAY_COUNT(gModeStrings), "enum_mismatch");
 
     str->appendf(" mode: %s", gModeStrings[fShadowMode]);
 
     str->append(")");
 }
 #endif