move common blur types into central header

src/animator/SkDrawBlur.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDrawBlur_DEFINED
 #define SkDrawBlur_DEFINED
 
 #include "SkPaintPart.h"
 #include "SkBlurMaskFilter.h"
 
 class SkDrawBlur : public SkDrawMaskFilter {
     DECLARE_DRAW_MEMBER_INFO(Blur);
     SkDrawBlur();
     virtual SkMaskFilter* getMaskFilter() SK_OVERRIDE;
 protected:
     SkScalar fSigma;
-    int /*SkBlurMaskFilter::BlurStyle*/ fBlurStyle;
+    int /*SkBlurStyle*/ fBlurStyle;
 
     typedef SkDrawMaskFilter INHERITED;
 };
 
 #endif // SkDrawBlur_DEFINED