Make bleed GM produce consistent bitmaps on all platforms

gm/bleed.cpp

Index: gm/bleed.cpp
diff --git a/gm/bleed.cpp b/gm/bleed.cpp
index daa9c1614944e2e91e8fefb363df10f3e17d10a5..da261efd32be9decd3560ab6fe22f2c266ae3cb3 100644
--- a/gm/bleed.cpp
+++ b/gm/bleed.cpp
@@ -111,7 +111,7 @@ static bool make_ringed_color_bitmap(TestPixels* result, int width, int height)
     static const SkPMColor kRed   = SkPreMultiplyColor(SK_ColorRED);
     static const SkPMColor kBlack = SkPreMultiplyColor(SK_ColorBLACK);
     static const SkPMColor kWhite = SkPreMultiplyColor(SK_ColorWHITE);
-    return make_ringed_bitmap<SkPMColor>(result, width, height, kBGRA_8888_SkColorType,
+    return make_ringed_bitmap<SkPMColor>(result, width, height, kN32_SkColorType,
                                          kPremul_SkAlphaType, kBlue, kRed, kBlack, kWhite);
 }