move common blur types into central header

gm/texteffects.cpp

 /*
  * Copyright 2011 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 "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkLayerRasterizer.h"
 
 static void r0(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
-    p.setMaskFilter(SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
+    p.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
                               SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))))->unref();
     rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
 
     p.setMaskFilter(NULL);
     p.setStyle(SkPaint::kStroke_Style);
     p.setStrokeWidth(SK_Scalar1);
     rastBuilder->addLayer(p);
 
     p.setAlpha(0x11);
     p.setStyle(SkPaint::kFill_Style);
@@ skipping 183 matching lines @@
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new TextEffectsGM; }
 static skiagm::GMRegistry reg(MyFactory);