Explicitly set text direction for TextRuns

Source/core/rendering/RenderCombineText.h

Index: Source/core/rendering/RenderCombineText.h
diff --git a/Source/core/rendering/RenderCombineText.h b/Source/core/rendering/RenderCombineText.h
index ce196d4c360e8d3675b8f212241610fb443f3255..d2731671d71fd5b61cf84586e70fdfa0bd2e9be4 100644
--- a/Source/core/rendering/RenderCombineText.h
+++ b/Source/core/rendering/RenderCombineText.h
@@ -39,7 +39,7 @@ public:
 
 private:
     virtual bool isCombineText() const { return true; }
-    virtual float width(unsigned from, unsigned length, const Font&, float xPosition, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
+    virtual float width(unsigned from, unsigned length, const Font&, float xPosition, TextDirection, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
     virtual const char* renderName() const { return "RenderCombineText"; }
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     virtual void setTextInternal(PassRefPtr<StringImpl>);