move common blur types into central header

gm/skbug1719.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkColorFilter.h"
 #include "SkBlurMaskFilter.h"
@@ skipping 62 matching lines @@
         drawPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
         drawPath.lineTo(824.f, 662.f);
         drawPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
         drawPath.close();
         drawPath.setFillType(SkPath::kEvenOdd_FillType);
 
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setColor(0xFF000000);
         paint.setMaskFilter(
-            SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
+            SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
                                      0.78867501f,
                                      SkBlurMaskFilter::kHighQuality_BlurFlag))->unref();
         paint.setColorFilter(
             SkColorFilter::CreateModeFilter(0xBFFFFFFF, SkXfermode::kSrcIn_Mode))->unref();
 
         canvas->clipPath(clipPath, SkRegion::kIntersect_Op, true);
         canvas->drawPath(drawPath, paint);
     }
 
 private:
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new SkBug1719GM;)
 
 }