SSE2 implementation of RGBA box blurs. This yields ~2X perf improvement on

src/opts/SkBlurImage_opts_none.cpp

Index: src/opts/SkBlurImage_opts_none.cpp
diff --git a/src/opts/SkBlurImage_opts_none.cpp b/src/opts/SkBlurImage_opts_none.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..dbdac8a95057d84edcfeb3a10e90e15792ce748d
--- /dev/null
+++ b/src/opts/SkBlurImage_opts_none.cpp
@@ -0,0 +1,14 @@
+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBlurImage_opts.h"
+
+bool SkBoxBlurGetPlatformProcs(SkBoxBlurProc* boxBlurX,
+                               SkBoxBlurProc* boxBlurY,
+                               SkBoxBlurProc* boxBlurXY) {
+    return false;
+}