Revert of Revert of Rename kPMColor_SkColorType to kN32_SkColorType.

gm/tilemodes.cpp

Index: gm/tilemodes.cpp
diff --git a/gm/tilemodes.cpp b/gm/tilemodes.cpp
index 5b97f13fc89e654b99e4551d4556cc3e0a2ed836..abecadae9a7e8bce822181d4cca9ccb739e602eb 100644
--- a/gm/tilemodes.cpp
+++ b/gm/tilemodes.cpp
@@ -50,7 +50,7 @@
 }
 
 static const SkColorType gColorTypes[] = {
-    kPMColor_SkColorType,
+    kN32_SkColorType,
     kRGB_565_SkColorType,
 };
 
@@ -166,7 +166,7 @@
 
 static SkShader* make_bm(SkShader::TileMode tx, SkShader::TileMode ty) {
     SkBitmap bm;
-    makebm(&bm, kPMColor_SkColorType, gWidth, gHeight);
+    makebm(&bm, kN32_SkColorType, gWidth, gHeight);
     return SkShader::CreateBitmapShader(bm, tx, ty);
 }