Publicly expose one accelerated swizzle.

src/core/SkSwizzle.cpp

Index: src/core/SkSwizzle.cpp
diff --git a/src/core/SkSwizzle.cpp b/src/core/SkSwizzle.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9c1971817bc78ca7276c82199dc64af0d0cadfaa
--- /dev/null
+++ b/src/core/SkSwizzle.cpp
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkSwizzle.h"
+
+#include "SkOpts.h"
+
+void SkSwapRB(uint32_t* dest, const uint32_t* src, int count) {
+    SkOpts::RGBA_to_BGRA(dest, src, count);
+}
+
+