Move distance field generation to the glyph cache

include/gpu/GrFontScaler.h

-/*
- * Copyright 2010 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrFontScaler_DEFINED
-#define GrFontScaler_DEFINED
-
-#include "GrGlyph.h"
-#include "GrKey.h"
-
-class SkPath;
-
-/**
- *  This is a virtual base class which Gr's interface to the host platform's
- *  font scaler.
- *
- *  The client is responsible for subclassing, and instantiating this. The
- *  instance is created for a specific font+size+matrix.
- */
-class GrFontScaler : public SkRefCnt {
-public:
-    SK_DECLARE_INST_COUNT(GrFontScaler)
-
-    virtual const GrKey* getKey() = 0;
-    virtual GrMaskFormat getMaskFormat() = 0;
-    virtual bool getPackedGlyphBounds(GrGlyph::PackedID, SkIRect* bounds) = 0;
-    virtual bool getPackedGlyphImage(GrGlyph::PackedID, int width, int height,
-                                     int rowBytes, void* image) = 0;
-    virtual bool getGlyphPath(uint16_t glyphID, SkPath*) = 0;
-
-private:
-    typedef SkRefCnt INHERITED;
-};
-
-#endif