Move flush logic into GrAtlasTextBlob

src/gpu/GrTextContext.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 GrTextContext_DEFINED
 #define GrTextContext_DEFINED
 
@@ skipping 64 matching lines @@
                            const SkScalar pos[], int scalarsPerPosition,
                            const SkPoint& offset, const SkIRect& clipBounds);
 
     static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
     // sets extent in stopVector and returns glyph count
     static int MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
                            const char text[], size_t byteLength, SkVector* stopVector);
     static uint32_t FilterTextFlags(const SkSurfaceProps& surfaceProps, const SkPaint& paint);
 
     friend class GrAtlasTextBatch;
+    friend class GrAtlasTextBlob; // for drawTextAsPath
 };
 
 #endif