Implement canvas2d direction attribute

Source/core/html/canvas/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 193 matching lines @@
 
     String font() const;
     void setFont(const String&);
 
     String textAlign() const;
     void setTextAlign(const String&);
 
     String textBaseline() const;
     void setTextBaseline(const String&);
 
+    String direction() const;
+    void setDirection(const String&);
+
     void fillText(const String& text, float x, float y);
     void fillText(const String& text, float x, float y, float maxWidth);
     void strokeText(const String& text, float x, float y);
     void strokeText(const String& text, float x, float y, float maxWidth);
     PassRefPtrWillBeRawPtr<TextMetrics> measureText(const String& text);
 
     LineCap getLineCap() const { return state().m_lineCap; }
     LineJoin getLineJoin() const { return state().m_lineJoin; }
 
     bool imageSmoothingEnabled() const;
@@ skipping 10 matching lines @@
     void clearHitRegions();
     HitRegion* hitRegionAtPoint(const LayoutPoint&);
     unsigned hitRegionsCount() const;
 
     void loseContext();
     void restoreContext();
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
+    enum Direction {
+        DirectionInherit,
+        DirectionRTL,
+        DirectionLTR
+    };
+
     class State FINAL : public CSSFontSelectorClient {
     public:
         State();
         virtual ~State();
 
         State(const State&);
         State& operator=(const State&);
 
         // CSSFontSelectorClient implementation
         virtual void fontsNeedUpdate(CSSFontSelector*) OVERRIDE;
@@ skipping 18 matching lines @@
         blink::WebBlendMode m_globalBlend;
         AffineTransform m_transform;
         bool m_invertibleCTM;
         Vector<float> m_lineDash;
         float m_lineDashOffset;
         bool m_imageSmoothingEnabled;
 
         // Text state.
         TextAlign m_textAlign;
         TextBaseline m_textBaseline;
+        Direction m_direction;
 
         String m_unparsedFont;
         Font m_font;
         bool m_realizedFont;
 
         bool m_hasClip;
     };
 
     CanvasRenderingContext2D(HTMLCanvasElement*, const Canvas2DContextAttributes* attrs, bool usesCSSCompatibilityParseMode);
 
@@ skipping 56 matching lines @@
 
     void validateStateStack();
 
     virtual bool is2d() const OVERRIDE { return true; }
     virtual bool isAccelerated() const OVERRIDE;
     virtual bool hasAlpha() const OVERRIDE { return m_hasAlpha; }
 
     virtual bool isTransformInvertible() const OVERRIDE { return state().m_invertibleCTM; }
 
     virtual blink::WebLayer* platformLayer() const OVERRIDE;
+    TextDirection toTextDirection(Direction, RenderStyle** computedStyle = nullptr) const;
 
     WillBeHeapVector<OwnPtrWillBeMember<State> > m_stateStack;
     OwnPtrWillBeMember<HitRegionManager> m_hitRegionManager;
     bool m_usesCSSCompatibilityParseMode;
     bool m_hasAlpha;
     bool m_isContextLost;
     bool m_contextRestorable;
     Canvas2DContextStorage m_storageMode;
     MutableStylePropertyMap m_fetchedFonts;
     unsigned m_tryRestoreContextAttemptCount;
     Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer;
     Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer;
     Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, context->is2d(), context.is2d());
 
 } // namespace blink
 
 #endif