Implement CSS Emphasis Marks for complex text

Source/platform/fonts/harfbuzz/HarfBuzzShaper.h

Index: Source/platform/fonts/harfbuzz/HarfBuzzShaper.h
diff --git a/Source/platform/fonts/harfbuzz/HarfBuzzShaper.h b/Source/platform/fonts/harfbuzz/HarfBuzzShaper.h
index 5996e686f6a9cfb8630d9986e17edcab76866378..916bab5a6bd9135ad73d0751e12cc1832dad1a49 100644
--- a/Source/platform/fonts/harfbuzz/HarfBuzzShaper.h
+++ b/Source/platform/fonts/harfbuzz/HarfBuzzShaper.h
@@ -45,7 +45,6 @@ namespace WebCore {
 
 class Font;
 class SimpleFontData;
-
 class HarfBuzzShaper FINAL {
 public:
     enum NormalizeMode {
@@ -53,7 +52,12 @@ public:
         NormalizeMirrorChars
     };
 
-    HarfBuzzShaper(const Font*, const TextRun&);
+    enum ForTextEmphasisOrNot {
+        NotForTextEmphasis,
+        ForTextEmphasis
+    };
+
+    HarfBuzzShaper(const Font*, const TextRun&, ForTextEmphasisOrNot = NotForTextEmphasis);
 
     void setDrawRange(int from, int to);
     bool shape(GlyphBuffer* = 0);
@@ -133,6 +137,7 @@ private:
     bool shapeHarfBuzzRuns();
     bool fillGlyphBuffer(GlyphBuffer*);
     void fillGlyphBufferFromHarfBuzzRun(GlyphBuffer*, HarfBuzzRun*, FloatPoint& firstOffsetOfNextRun);
+    void fillGlyphBufferForTextEmphasis(GlyphBuffer*, HarfBuzzRun* currentRun);
     void setGlyphPositionsForHarfBuzzRun(HarfBuzzRun*, hb_buffer_t*);
     void addHarfBuzzRun(unsigned startCharacter, unsigned endCharacter, const SimpleFontData*, UScriptCode);
 
@@ -157,6 +162,8 @@ private:
     int m_fromIndex;
     int m_toIndex;
 
+    ForTextEmphasisOrNot m_forTextEmphasis;
+
     float m_totalWidth;
 
     friend struct CachedShapingResults;