Publicly expose one accelerated swizzle.

SkOpts is intentionally internal, but we want to give Chrome access
to those pieces that would seriously benefit them.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1822363002

Review URL: https://codereview.chromium.org/1822363002
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 7c873c9..443029d 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -280,6 +280,7 @@
         '<(skia_src_path)/core/SkStrokerPriv.cpp',
         '<(skia_src_path)/core/SkStrokerPriv.h',
         '<(skia_src_path)/core/SkSurfacePriv.h',
+        '<(skia_src_path)/core/SkSwizzle.cpp',
         '<(skia_src_path)/core/SkTaskGroup.cpp',
         '<(skia_src_path)/core/SkTaskGroup.h',
         '<(skia_src_path)/core/SkTDPQueue.h',
@@ -393,6 +394,7 @@
         '<(skia_include_path)/core/SkString.h',
         '<(skia_include_path)/core/SkStrokeRec.h',
         '<(skia_include_path)/core/SkSurface.h',
+        '<(skia_include_path)/core/SkSwizzle.h',
         '<(skia_include_path)/core/SkTRegistry.h',
         '<(skia_include_path)/core/SkTextBlob.h',
         '<(skia_include_path)/core/SkTime.h',