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

tests/BlurTest.cpp

Index: tests/BlurTest.cpp
===================================================================
--- tests/BlurTest.cpp	(revision 11004)
+++ tests/BlurTest.cpp	(working copy)
@@ -95,7 +95,7 @@
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(SkIntToScalar(strokeWidth));
 
-    SkScalar radius = SkIntToScalar(5);
+    SkScalar sigma = SkFloatToScalar(3.38675f);
     for (int style = 0; style < SkBlurMaskFilter::kBlurStyleCount; ++style) {
         SkBlurMaskFilter::BlurStyle blurStyle =
             static_cast<SkBlurMaskFilter::BlurStyle>(style);
@@ -103,7 +103,7 @@
         const uint32_t flagPermutations = SkBlurMaskFilter::kAll_BlurFlag;
         for (uint32_t flags = 0; flags < flagPermutations; ++flags) {
             SkMaskFilter* filter;
-            filter = SkBlurMaskFilter::Create(radius, blurStyle, flags);
+            filter = SkBlurMaskFilter::Create(blurStyle, sigma, flags);
 
             paint.setMaskFilter(filter);
             filter->unref();