Implement canvas2d direction attribute

Source/core/html/canvas/CanvasRenderingContext2D.idl

Index: Source/core/html/canvas/CanvasRenderingContext2D.idl
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.idl b/Source/core/html/canvas/CanvasRenderingContext2D.idl
index 2f74cbea9c7a610c0a304be31848aa5daf8289aa..aa1f4cc4c7a8f62c8fcfc9cf6eb4fc7bf5654e12 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.idl
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.idl
@@ -159,6 +159,7 @@ enum CanvasFillRule { "nonzero", "evenodd" };
     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")
+    attribute DOMString direction; // "inherit", "rtl", "ltr" (default: "inherit")

[Justin Novosad, 2014/08/26 15:01:49]

This feature was only approved for implementation.  You need to hide it behind a
flag until an intent to ship is approved by the API owners on blink-dev. You can
just add [RuntimeEnabled=ExperimentalCanvasFeatures] at the beginning of this
line.

 
     // Non-standard APIs. Candidates for deprecation
     // https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D