Add tab characters support in complex path

Source/platform/fonts/shaping/HarfBuzzShaper.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 122 matching lines @@
     };
 
     float nextExpansionPerOpportunity();
     void setExpansion(float);
     void setFontFeatures();
 
     bool createHarfBuzzRuns();
     bool createHarfBuzzRunsForSingleCharacter();
     PassRefPtr<ShapeResult> shapeHarfBuzzRuns();
     void shapeResult(ShapeResult*, unsigned, const HarfBuzzRun*, hb_buffer_t*);
+    void shapeResultForTabulationCharacters(ShapeResult*, unsigned, const HarfBuzzRun*);
     float adjustSpacing(ShapeResult::RunInfo*, size_t glyphIndex, unsigned currentCharacterIndex, float& offsetX, float& totalAdvance);
     void addHarfBuzzRun(unsigned startCharacter, unsigned endCharacter, const SimpleFontData*, UScriptCode);
 
     OwnPtr<UChar[]> m_normalizedBuffer;
     unsigned m_normalizedBufferLength;
 
     float m_wordSpacingAdjustment; // Delta adjustment (pixels) for each word break.
     float m_letterSpacing; // Pixels to be added after each glyph.
     unsigned m_expansionOpportunityCount;
 
     Vector<hb_feature_t, 4> m_features;
     Vector<HarfBuzzRun, 16> m_harfBuzzRuns;
 };
 
 } // namespace blink
 
 #endif // HarfBuzzShaper_h