move common blur types into central header

include/core/SkBlurTypes.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkBlurTypes_DEFINED
+#define SkBlurTypes_DEFINED
+
+#include "SkTypes.h"
+
+enum SkBlurStyle {
+    kNormal_SkBlurStyle,  //!< fuzzy inside and outside
+    kSolid_SkBlurStyle,   //!< solid inside, fuzzy outside
+    kOuter_SkBlurStyle,   //!< nothing inside, fuzzy outside
+    kInner_SkBlurStyle,   //!< fuzzy inside, nothing outside
+
+    kLastEnum_SkBlurStyle = kInner_SkBlurStyle
+};
+
+enum SkBlurQuality {
+    kLow_SkBlurQuality,     //!< e.g. box filter
+    kHigh_SkBlurQuality,    //!< e.g. 3-pass similar to gaussian
+
+    kLastEnum_SkBlurQuality
+};
+
+#endif