Make SkTextBlob::RunIterator public.

include/core/SkTextBlob.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 SkTextBlob_DEFINED
 #define SkTextBlob_DEFINED
 
@@ skipping 28 matching lines @@
 
     /**
      *  Recreate an SkTextBlob that was serialized into a buffer.
      *
      *  @param  SkReadBuffer Serialized blob data.
      *  @return A new SkTextBlob representing the serialized data, or NULL if the buffer is
      *          invalid.
      */
     static const SkTextBlob* CreateFromBuffer(SkReadBuffer&);
 
-private:
     enum GlyphPositioning {
         kDefault_Positioning      = 0, // Default glyph advances -- zero scalars per glyph.
         kHorizontal_Positioning   = 1, // Horizontal positioning -- one scalar per glyph.
         kFull_Positioning         = 2  // Point positioning -- two scalars per glyph.
     };
 
+private:
     class RunRecord;
 
-    class RunIterator {
-    public:
-        RunIterator(const SkTextBlob* blob);
-
-        bool done() const;
-        void next();
-
-        uint32_t glyphCount() const;
-        const uint16_t* glyphs() const;
-        const SkScalar* pos() const;
-        const SkPoint& offset() const;
-        void applyFontToPaint(SkPaint*) const;
-        GlyphPositioning positioning() const;
-        bool isLCD() const;
-
-    private:
-        const RunRecord* fCurrentRun;
-        int              fRemainingRuns;
-
-        SkDEBUGCODE(uint8_t* fStorageTop;)
-    };
-
     SkTextBlob(int runCount, const SkRect& bounds);
 
     virtual ~SkTextBlob();
 
     // Memory for objects of this class is created with sk_malloc rather than operator new and must
     // be freed with sk_free.
     void operator delete(void* p) { sk_free(p); }
     void* operator new(size_t) {
         SkFAIL("All blobs are created by placement new.");
         return sk_malloc_throw(0);
     }
     void* operator new(size_t, void* p) { return p; }
 
     static unsigned ScalarsPerGlyph(GlyphPositioning pos);
 
-    friend class GrAtlasTextContext;
-    friend class GrStencilAndCoverTextContext;
-    friend class GrTextBlobCache;
-    friend class GrTextContext;
-    friend class SkBaseDevice;
     friend class SkTextBlobBuilder;
-    friend class TextBlobTester;
+    friend class SkTextBlobRunIterator;
 
     const int        fRunCount;
     const SkRect     fBounds;
     const uint32_t fUniqueID;
 
     SkDEBUGCODE(size_t fStorageSize;)
 
     // The actual payload resides in externally-managed storage, following the object.
     // (see the .cpp for more details)
 
@@ skipping 90 matching lines @@
 
     SkRect                 fBounds;
     int                    fRunCount;
     bool                   fDeferredBounds;
     size_t                 fLastRun; // index into fStorage
 
     RunBuffer              fCurrentRunBuffer;
 };
 
 #endif // SkTextBlob_DEFINED