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

gm/blurs.cpp

Index: gm/blurs.cpp
===================================================================
--- gm/blurs.cpp	(revision 11004)
+++ gm/blurs.cpp	(working copy)
@@ -59,8 +59,9 @@
             paint.setColor(SK_ColorBLUE);
             for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++) {
                 if (gRecs[i].fStyle != NONE) {
-                    SkMaskFilter* mf = SkBlurMaskFilter::Create(
-                            SkIntToScalar(20), gRecs[i].fStyle, flags);
+                    SkMaskFilter* mf = SkBlurMaskFilter::Create(gRecs[i].fStyle,
+                                                                SkFloatToScalar(12.047f), 
+                                                                flags);
                     paint.setMaskFilter(mf)->unref();
                 } else {
                     paint.setMaskFilter(NULL);
@@ -72,10 +73,9 @@
             }
             // draw text
             {
-                SkMaskFilter* mf = SkBlurMaskFilter::Create(
-                        SkIntToScalar(4),
-                        SkBlurMaskFilter::kNormal_BlurStyle,
-                        flags);
+                SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
+                                                            SkFloatToScalar(2.8094f),
+                                                            flags);
                 paint.setMaskFilter(mf)->unref();
                 SkScalar x = SkIntToScalar(70);
                 SkScalar y = SkIntToScalar(400);