Fix gaussian blur for small sigma.

gm/imagefilterscropexpand.cpp

Index: gm/imagefilterscropexpand.cpp
diff --git a/gm/imagefilterscropexpand.cpp b/gm/imagefilterscropexpand.cpp
index b173648a8cca7d855c1d87cf671acfd626e95d4a..4fa9b0084e96e7a5a3b7702b647bc1a4f09588bd 100644
--- a/gm/imagefilterscropexpand.cpp
+++ b/gm/imagefilterscropexpand.cpp
@@ -35,7 +35,7 @@ protected:
         return SkString("imagefilterscropexpand");
     }
 
-    SkISize onISize() override { return SkISize::Make(570, 650); }
+    SkISize onISize() override { return SkISize::Make(650, 650); }
 
     void onDraw(SkCanvas* canvas) override {
         SkAutoTUnref<SkColorFilter> cf(
@@ -78,6 +78,9 @@ protected:
                 cfAlphaTrans, noopCropped.get(), &big_rect));
 
             Draw(canvas, checkerboard, rect, SkBlurImageFilter::Create(
+                0.3f, 0.3f, noopCropped.get(), &big_rect));
+
+            Draw(canvas, checkerboard, rect, SkBlurImageFilter::Create(
                 8.0f, 8.0f, noopCropped.get(), &big_rect));
 
             Draw(canvas, checkerboard, rect, SkDilateImageFilter::Create(