float xfermodes (burn, dodge, softlight) in Sk8f, possibly using AVX.

src/opts/SkOpts_avx.cpp

Index: src/opts/SkOpts_avx.cpp
diff --git a/src/opts/SkOpts_avx.cpp b/src/opts/SkOpts_avx.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..88021530023bc080ec9c86fa6f2088c83dfdacb8
--- /dev/null
+++ b/src/opts/SkOpts_avx.cpp
@@ -0,0 +1,17 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkOpts.h"
+#define SK_OPTS_NS sk_avx
+#include "SkXfermode_opts.h"
+
+namespace SkOpts {
+    void Init_avx() {
+        create_xfermode = sk_avx::create_xfermode;
+    }
+}
+