move common blur types into central header

gm/rects.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 "SkBlurDrawLooper.h"
 #include "SkBlurMask.h"
@@ skipping 46 matching lines @@
             p.setAlpha(0x66);
             fPaints.push_back(p);
         }
 
         {
             // AA with mask filter
             SkPaint p;
             p.setColor(SK_ColorWHITE);
             p.setAntiAlias(true);
             SkMaskFilter* mf = SkBlurMaskFilter::Create(
-                                   SkBlurMaskFilter::kNormal_BlurStyle,
+                                   kNormal_SkBlurStyle,
                                    SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
                                    SkBlurMaskFilter::kHighQuality_BlurFlag);
             p.setMaskFilter(mf)->unref();
             fPaints.push_back(p);
         }
 
         {
             // AA with radial shader
             SkPaint p;
             p.setColor(SK_ColorWHITE);
@@ skipping 214 matching lines @@
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new RectsGM; }
 static GMRegistry reg(MyFactory);
 
 }