[whatwg] addPath and CanvasPathMethods

[Rik Cabanier]

addPath is currently defined on the Path2D object. [1]
Is there a reason why it's not defined on CanvasPathMethods instead? That
way this method is available on the 2d contest so you can append a path to
the current graphics state.

This would also negate the need for setCurrentPath.

1:
http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-path-addpath