Push sigma-based blur interface into our GMs/benches/tests/samplecode

gm/drawbitmaprect.cpp

Index: gm/drawbitmaprect.cpp
===================================================================
--- gm/drawbitmaprect.cpp	(revision 11108)
+++ gm/drawbitmaprect.cpp	(working copy)
@@ -6,14 +6,12 @@
  * found in the LICENSE file.
  */
 #include "gm.h"
-#include "SkShader.h"
-#include "SkColorPriv.h"
+#include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
-
-// effects
+#include "SkColorPriv.h"
 #include "SkGradientShader.h"
+#include "SkShader.h"
 
-
 namespace skiagm {
 
 static SkBitmap make_chessbm(int w, int h) {
@@ -169,8 +167,8 @@
 
             srcRect.setXYWH(1, 1, 3, 3);
             SkMaskFilter* mf = SkBlurMaskFilter::Create(
-                5,
                 SkBlurMaskFilter::kNormal_BlurStyle,
+                SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
                 SkBlurMaskFilter::kHighQuality_BlurFlag |
                 SkBlurMaskFilter::kIgnoreTransform_BlurFlag);
             paint.setMaskFilter(mf)->unref();