Implement canvas2d direction attribute

Source/core/html/canvas/CanvasRenderingContext2D.idl

 /*
  * Copyright (C) 2006 Apple Computer, 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 141 matching lines @@
 
     // dashed lines
     void setLineDash(sequence<unrestricted float> dash);
     sequence<unrestricted float> getLineDash();
     attribute unrestricted float lineDashOffset;
 
     // text
     attribute DOMString font; // (default 10px sans-serif)
     attribute DOMString textAlign; // "start", "end", "left", "right", "center" (default: "start")
     attribute DOMString textBaseline; // "top", "hanging", "middle", "alphabetic", "ideographic", "bottom" (default: "alphabetic")
+    [RuntimeEnabled=ExperimentalCanvasFeatures] attribute DOMString direction; // "inherit", "rtl", "ltr" (default: "inherit")
 
     // Non-standard APIs. Candidates for deprecation
     // https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D
     [MeasureAs=CanvasRenderingContext2DSetAlpha] void setAlpha(unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetCompositeOperation] void setCompositeOperation(DOMString compositeOperation);
     [MeasureAs=CanvasRenderingContext2DSetLineWidth] void setLineWidth(unrestricted float width);
     [MeasureAs=CanvasRenderingContext2DSetLineCap] void setLineCap(DOMString cap);
     [MeasureAs=CanvasRenderingContext2DSetLineJoin] void setLineJoin(DOMString join);
     [MeasureAs=CanvasRenderingContext2DSetMiterLimit] void setMiterLimit(unrestricted float limit);
     [MeasureAs=CanvasRenderingContext2DClearShadow] void clearShadow();
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(DOMString color, optional unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float grayLevel, optional unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float r, unrestricted float g, unrestricted float b, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float c, unrestricted float m, unrestricted float y, unrestricted float k, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(DOMString color, optional unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float grayLevel, optional unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float r, unrestricted float g, unrestricted float b, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float c, unrestricted float m, unrestricted float y, unrestricted float k, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DDrawImageFromRect] void drawImageFromRect(
         HTMLImageElement? image, optional unrestricted float sx, optional unrestricted float sy, optional unrestricted float sw, optional unrestricted float sh,
         optional unrestricted float dx, optional unrestricted float dy, optional unrestricted float dw, optional unrestricted float dh, optional DOMString compositeOperation);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, optional DOMString color, optional unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float grayLevel, optional unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float r, unrestricted float g, unrestricted float b, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float c, unrestricted float m, unrestricted float y, unrestricted float k, unrestricted float a);
 };
 
 CanvasRenderingContext2D implements CanvasPathMethods;