Change signatures of filter bounds methods to return a rect.

include/effects/SkDropShadowImageFilter.h

Index: include/effects/SkDropShadowImageFilter.h
diff --git a/include/effects/SkDropShadowImageFilter.h b/include/effects/SkDropShadowImageFilter.h
index 2be77ce1a9cfcff6089328670fa7ce40930bc6a9..1212c3f575aa2178ab2c04e252206c891a0fcef6 100644
--- a/include/effects/SkDropShadowImageFilter.h
+++ b/include/effects/SkDropShadowImageFilter.h
@@ -27,7 +27,7 @@ public:
                                            cropRect);
     }
 
-    void computeFastBounds(const SkRect&, SkRect*) const override;
+    SkRect computeFastBounds(const SkRect&) const override;
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDropShadowImageFilter)
 
@@ -35,8 +35,7 @@ protected:
     void flatten(SkWriteBuffer&) const override;
     bool onFilterImageDeprecated(Proxy*, const SkBitmap& source, const Context&, SkBitmap* result,
                                  SkIPoint* loc) const override;
-    void onFilterNodeBounds(const SkIRect& src, const SkMatrix&,
-                            SkIRect* dst, MapDirection) const override;
+    SkIRect onFilterNodeBounds(const SkIRect& src, const SkMatrix&, MapDirection) const override;
 
 private:
     SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,