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

gm/rects.cpp

Index: gm/rects.cpp
===================================================================
--- gm/rects.cpp	(revision 11004)
+++ gm/rects.cpp	(working copy)
@@ -53,8 +53,9 @@
             SkPaint p;
             p.setColor(SK_ColorWHITE);
             p.setAntiAlias(true);
-            SkMaskFilter* mf = SkBlurMaskFilter::Create(SkIntToScalar(5),
+            SkMaskFilter* mf = SkBlurMaskFilter::Create(
                                    SkBlurMaskFilter::kNormal_BlurStyle,
+                                   SkFloatToScalar(3.38675f),
                                    SkBlurMaskFilter::kHighQuality_BlurFlag);
             p.setMaskFilter(mf)->unref();
             fPaints.push_back(p);
@@ -84,8 +85,8 @@
             p.setColor(SK_ColorWHITE);
             p.setAntiAlias(true);
             SkBlurDrawLooper* shadowLooper =
-                new SkBlurDrawLooper (SkIntToScalar(10), SkIntToScalar(5),
-                                      SkIntToScalar(10), SK_ColorWHITE,
+                new SkBlurDrawLooper (SK_ColorWHITE, SkFloatToScalar(6.2735f), 
+                                      SkIntToScalar(5), SkIntToScalar(10),
                                       SkBlurDrawLooper::kIgnoreTransform_BlurFlag |
                                       SkBlurDrawLooper::kOverrideColor_BlurFlag |
                                       SkBlurDrawLooper::kHighQuality_BlurFlag);