Make SkTDArray accessors const-friendly

src/pdf/SkPDFFont.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFFont_DEFINED
@@ skipping 31 matching lines @@
         SkPDFFont* fFont;
         SkPDFGlyphSet* fGlyphSet;
     };
 
     SkPDFGlyphSetMap();
     ~SkPDFGlyphSetMap();
 
     class F2BIter {
     public:
         explicit F2BIter(const SkPDFGlyphSetMap& map);
-        FontGlyphSetPair* next() const;
+        const FontGlyphSetPair* next() const;
         void reset(const SkPDFGlyphSetMap& map);
 
     private:
         const SkTDArray<FontGlyphSetPair>* fMap;
         mutable int fIndex;
     };
 
     void merge(const SkPDFGlyphSetMap& usage);
     void reset();
 
@@ skipping 130 matching lines @@
     SkAutoTUnref<SkPDFDict> fDescriptor;
 
     SkAdvancedTypefaceMetrics::FontType fFontType;
 
     // This should be made a hash table if performance is a problem.
     static SkTDArray<FontRec>& CanonicalFonts();
     static SkBaseMutex& CanonicalFontsMutex();
 };
 
 #endif