Sk4px blit mask.

src/core/SkOpts.cpp

Index: src/core/SkOpts.cpp
diff --git a/src/core/SkOpts.cpp b/src/core/SkOpts.cpp
index 17eab7e51cb02fb48c16d0bf06c5da8d065006a5..2bfc1af899ca34a2f71aff4eabd1f84850c444c5 100644
--- a/src/core/SkOpts.cpp
+++ b/src/core/SkOpts.cpp
@@ -9,6 +9,7 @@
 #include "SkOpts.h"
 
 #define SK_OPTS_NS portable
+#include "SkBlitMask_opts.h"
 #include "SkBlurImageFilter_opts.h"
 #include "SkFloatingPoint_opts.h"
 #include "SkMorphologyImageFilter_opts.h"
@@ -50,6 +51,8 @@ namespace SkOpts {
     decltype(texture_compressor)       texture_compressor = portable::texture_compressor;
     decltype(fill_block_dimensions) fill_block_dimensions = portable::fill_block_dimensions;
 
+    decltype(blit_mask_d32_a8) blit_mask_d32_a8 = portable::blit_mask_d32_a8;
+
     // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp.
     void Init_sse2();
     void Init_ssse3();