NEON optimizations for gray -> RGBA (or BGRA) conversions

src/core/SkOpts.h

Index: src/core/SkOpts.h
diff --git a/src/core/SkOpts.h b/src/core/SkOpts.h
index 41ad8ebfe85ad7c474a21d6cbb49a11df1272cb6..b5286e4ec90c3f11530f3442dceb592ac21f2b1d 100644
--- a/src/core/SkOpts.h
+++ b/src/core/SkOpts.h
@@ -61,7 +61,8 @@ namespace SkOpts {
                         RGBA_to_rgbA,  // i.e. just premultiply
                         RGBA_to_bgrA,  // i.e. swap RB and premultiply
                         RGB_to_RGB1,   // i.e. insert an opaque alpha
-                        RGB_to_BGR1;   // i.e. swap RB and insert an opaque alpha
+                        RGB_to_BGR1,   // i.e. swap RB and insert an opaque alpha
+                        gray_to_RGB1;  // i.e. set color channels to same value + an opaque alpha
 }
 
 #endif//SkOpts_DEFINED