move common blur types into central header

BUG=skia:
R=scroggo@google.com, djsollen@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/253833002

git-svn-id: http://skia.googlecode.com/svn/trunk@14411 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/BlurRectBench.cpp b/bench/BlurRectBench.cpp
index d4876ce..6871e0e 100644
--- a/bench/BlurRectBench.cpp
+++ b/bench/BlurRectBench.cpp
@@ -91,7 +91,7 @@
     virtual void makeBlurryRect(const SkRect& r) SK_OVERRIDE {
         SkMask mask;
         SkBlurMask::BlurRect(SkBlurMask::ConvertRadiusToSigma(this->radius()),
-                             &mask, r, SkBlurMask::kNormal_Style);
+                             &mask, r, kNormal_SkBlurStyle);
         SkMask::FreeImage(mask.fImage);
     }
 private:
@@ -146,8 +146,7 @@
         SkMask mask;
         mask.fImage = NULL;
         SkBlurMask::BoxBlur(&mask, fSrcMask, SkBlurMask::ConvertRadiusToSigma(this->radius()),
-                            SkBlurMask::kNormal_Style,
-                            SkBlurMask::kHigh_Quality);
+                            kNormal_SkBlurStyle, kHigh_SkBlurQuality);
         SkMask::FreeImage(mask.fImage);
     }
 private:
@@ -174,7 +173,7 @@
         SkMask mask;
         mask.fImage = NULL;
         SkBlurMask::BlurGroundTruth(SkBlurMask::ConvertRadiusToSigma(this->radius()),
-                                    &mask, fSrcMask, SkBlurMask::kNormal_Style);
+                                    &mask, fSrcMask, kNormal_SkBlurStyle);
         SkMask::FreeImage(mask.fImage);
     }
 private: