add SK_ATTR_DEPRECATED -- will need to disable for chrome, since it triggers a warning

src/effects/SkBlurMask.h

Index: src/effects/SkBlurMask.h
diff --git a/src/effects/SkBlurMask.h b/src/effects/SkBlurMask.h
index 061cfdec52e0b7f3893b42b17b46a5c31e1e84ce..e0b8d54ce1e11f94b821e166709457e9147da87b 100644
--- a/src/effects/SkBlurMask.h
+++ b/src/effects/SkBlurMask.h
@@ -44,17 +44,19 @@ public:
                                 Style style,
                                 SkIPoint* margin = NULL);
 
-    // DEPRECATED - radius-based
+    SK_ATTR_DEPRECATED("use sigma version")
     static bool BlurRect(SkMask *dst, const SkRect &src,
                          SkScalar radius, Style style,
                          SkIPoint *margin = NULL,
                          SkMask::CreateMode createMode =
                                                 SkMask::kComputeBoundsAndRenderImage_CreateMode);
-    // DEPRECATED - radius-based
+
+    SK_ATTR_DEPRECATED("use sigma version")
     static bool Blur(SkMask* dst, const SkMask& src,
                      SkScalar radius, Style style, Quality quality,
                      SkIPoint* margin = NULL);
-    // DEPRECATED - radius-based
+
+    SK_ATTR_DEPRECATED("use sigma version")
     static bool BlurGroundTruth(SkMask* dst, const SkMask& src,
                                 SkScalar radius, Style style,
                                 SkIPoint* margin = NULL);