Port SkXfermode opts to SkOpts.h

Renames Sk4pxXfermode.h to SkXfermode_opts.h,
and refactors it a tiny bit internally.

This moves xfermode optimization from being "compile-time everywhere but NEON"
to simply "runtime everywhere".  I don't anticipate any effect on perf or
correctness.

BUG=skia:4117

Review URL: https://codereview.chromium.org/1264543006

1 files changed, 0 insertions, 14 deletions

diff --git a/src/opts/SkXfermode_opts_arm_neon.cpp b/src/opts/SkXfermode_opts_arm_neon.cpp
deleted file mode 100644
index ae0fd17b25..0000000000
--- a/src/opts/SkXfermode_opts_arm_neon.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-// Including Sk4pxXfermode.h from this file should find SK_ARM_HAS_NEON is defined.
-#include "Sk4pxXfermode.h"
-
-SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl_neon(const ProcCoeff& r, SkXfermode::Mode m);
-SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl_neon(const ProcCoeff& r, SkXfermode::Mode m) {
-    return SkCreate4pxXfermode(r, m);
-}