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

samplecode/SampleBlur.cpp

Index: samplecode/SampleBlur.cpp
===================================================================
--- samplecode/SampleBlur.cpp	(revision 11004)
+++ samplecode/SampleBlur.cpp	(working copy)
@@ -97,8 +97,8 @@
             paint.setColor(SK_ColorBLUE);
             for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++) {
                 if (gRecs[i].fStyle != NONE) {
-                    SkMaskFilter* mf = SkBlurMaskFilter::Create(20,
-                                                                gRecs[i].fStyle,
+                    SkMaskFilter* mf = SkBlurMaskFilter::Create(gRecs[i].fStyle,
+                                                                SkFloatToScalar(12.047f),
                                                                 flags);
                     paint.setMaskFilter(mf)->unref();
                 } else {
@@ -109,8 +109,8 @@
             }
             // draw text
             {
-                SkMaskFilter* mf = SkBlurMaskFilter::Create(4,
-                                                            SkBlurMaskFilter::kNormal_BlurStyle,
+                SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
+                                                            SkFloatToScalar(2.8094f),
                                                             flags);
                 paint.setMaskFilter(mf)->unref();
                 SkScalar x = SkIntToScalar(70);