Make fID and MixedID calculations private

include/core/SkPaint.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 SkPaint_DEFINED
 #define SkPaint_DEFINED
 
 #include "SkColor.h"
 #include "SkDrawLooper.h"
 #include "SkFilterQuality.h"
 #include "SkMatrix.h"
 #include "SkXfermode.h"
 
 // TODO: clean up Skia internals so we can remove this and only keep it for clients
 #define SK_SUPPORT_LEGACY_FILTERLEVEL_ENUM
 
 class SkAnnotation;
 class SkAutoGlyphCache;
 class SkColorFilter;
 class SkDescriptor;
 struct SkDeviceProperties;
 class SkReadBuffer;
 class SkWriteBuffer;
-struct SkGlyph;
+class SkGlyph;
 struct SkRect;
 class SkGlyphCache;
 class SkImageFilter;
 class SkMaskFilter;
 class SkPath;
 class SkPathEffect;
 struct SkPoint;
 class SkRasterizer;
 class SkShader;
 class SkTypeface;
@@ skipping 1098 matching lines @@
     friend class GrBitmapTextContext;
     friend class GrDistanceFieldTextContext;
     friend class GrStencilAndCoverTextContext;
     friend class GrPathRendering;
     friend class GrGLPathRendering;
     friend class SkTextToPathIter;
     friend class SkCanonicalizePaint;
 };
 
 #endif