Make SkBlurImageFilter capable of cropping during blur

src/core/SkOpts.h

Index: src/core/SkOpts.h
diff --git a/src/core/SkOpts.h b/src/core/SkOpts.h
index 6fa1e46cd98d274160b1282ec66fbdd73c6a5d57..1b94126cf724bff8d233e8dc305a80d95fa79e5b 100644
--- a/src/core/SkOpts.h
+++ b/src/core/SkOpts.h
@@ -33,7 +33,7 @@ namespace SkOpts {
     // May return nullptr if we haven't specialized the given Mode.
     extern SkXfermode* (*create_xfermode)(const ProcCoeff&, SkXfermode::Mode);
 
-    typedef void (*BoxBlur)(const SkPMColor*, int, SkPMColor*, int, int, int, int, int);
+    typedef void (*BoxBlur)(const SkPMColor*, int, const SkIRect& srcBounds, SkPMColor*, int, int, int, int, int);
     extern BoxBlur box_blur_xx, box_blur_xy, box_blur_yx;
 
     typedef void (*Morph)(const SkPMColor*, SkPMColor*, int, int, int, int, int);