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

gm/drawlooper.cpp

Index: gm/drawlooper.cpp
===================================================================
--- gm/drawlooper.cpp	(revision 11004)
+++ gm/drawlooper.cpp	(working copy)
@@ -62,12 +62,12 @@
             SkPaint::Style  fStyle;
             SkScalar        fWidth;
             SkScalar        fOffset;
-            int             fBlur;
+            SkScalar        fSigma;
         } gParams[] = {
             { SK_ColorWHITE, SkPaint::kStroke_Style, SkIntToScalar(1)*3/4, 0, 0 },
             { SK_ColorRED, SkPaint::kStroke_Style, SkIntToScalar(4), 0, 0 },
             { SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0 },
-            { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), 3 }
+            { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), SkFloatToScalar(2.23205f) }
         };
 
         fLooper = new SkLayerDrawLooper;
@@ -84,9 +84,9 @@
             paint->setColor(gParams[i].fColor);
             paint->setStyle(gParams[i].fStyle);
             paint->setStrokeWidth(gParams[i].fWidth);
-            if (gParams[i].fBlur > 0) {
-                SkMaskFilter* mf = SkBlurMaskFilter::Create(SkIntToScalar(gParams[i].fBlur),
-                                                            SkBlurMaskFilter::kNormal_BlurStyle);
+            if (gParams[i].fSigma > 0) {
+                SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
+                                                            gParams[i].fSigma);
                 paint->setMaskFilter(mf)->unref();
             }
         }