Implement a speedup for Y-only blurs by transposing.

R=mtklein@google.com, mtklein, reed@google.com
BUG=

Review URL: https://codereview.chromium.org/66413007

git-svn-id: http://skia.googlecode.com/svn/trunk@12227 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/opts/SkBlurImage_opts_SSE2.h b/src/opts/SkBlurImage_opts_SSE2.h
index 4dd804a..c8deea4 100644
--- a/src/opts/SkBlurImage_opts_SSE2.h
+++ b/src/opts/SkBlurImage_opts_SSE2.h
@@ -9,4 +9,5 @@
 
 bool SkBoxBlurGetPlatformProcs_SSE2(SkBoxBlurProc* boxBlurX,
                                     SkBoxBlurProc* boxBlurY,
-                                    SkBoxBlurProc* boxBlurXY);
+                                    SkBoxBlurProc* boxBlurXY,
+                                    SkBoxBlurProc* boxBlurYX);