Add unit tests to text context

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
 
 #include "GrClip.h"
 #include "GrGlyph.h"
 #include "GrPaint.h"
 #include "SkDeviceProperties.h"
-
 #include "SkPostConfig.h"
 
 class GrClip;
 class GrContext;
 class GrDrawTarget;
 class GrFontScaler;
 class SkDrawFilter;
 class SkGpuDevice;
 class SkTextBlob;
 
@@ skipping 62 matching lines @@
 
     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);
 
     friend class BitmapTextBatch;
 };
 
 #endif