Support the non-native (RGBA/BGRA) swizzle

src/codec/SkGifCodec.cpp

Index: src/codec/SkGifCodec.cpp
diff --git a/src/codec/SkGifCodec.cpp b/src/codec/SkGifCodec.cpp
index 774131f648039c5c40993136be133f199a6f74cd..75e9d63fa72ad3e6099341db39eb7de376d0b470 100644
--- a/src/codec/SkGifCodec.cpp
+++ b/src/codec/SkGifCodec.cpp
@@ -410,8 +410,9 @@ void SkGifCodec::initializeColorTable(const SkImageInfo& dstInfo, SkPMColor* inp
         // giflib guarantees these properties
         SkASSERT(colorCount == (unsigned) (1 << (colorMap->BitsPerPixel)));
         SkASSERT(colorCount <= 256);
+        PackColorProc proc = choose_pack_color_proc(false, dstInfo.colorType());
         for (uint32_t i = 0; i < colorCount; i++) {
-            colorPtr[i] = SkPackARGB32(0xFF, colorMap->Colors[i].Red,
+            colorPtr[i] = proc(0xFF, colorMap->Colors[i].Red,
                     colorMap->Colors[i].Green, colorMap->Colors[i].Blue);
         }
     }