Adds SVGImageElement as a CanvasImageSource

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.idl

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 // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#canvasrenderingcontext2d
 
+// The spec specifies:
+//    typedef (HTMLImageElement or
+//             SVGImageElement) HTMLOrSVGImageElement;
+// but there's a problem with our IDL code generator for typedef-in-typedef,
+// so we split this into two for simplicity. There's no difference from a user
+// perspective.
+
 typedef (CSSImageValue or
          HTMLImageElement or
+         SVGImageElement or

[Justin Novosad, 2017/03/01 20:56:30]

I'm not sure there is a way to put a union member behind a flag, so let's just
wait for lgtm to ship from API owners.

[fserb, 2017/03/06 21:05:13]

k

          HTMLVideoElement or
          HTMLCanvasElement or
          ImageBitmap or
          OffscreenCanvas) CanvasImageSource;
 
 enum CanvasFillRule { "nonzero", "evenodd" };
 enum ImageSmoothingQuality {"low", "medium", "high"};
 
 [
     DependentLifetime,
@@ skipping 101 matching lines @@
 
     // 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")
 
 };
 
 CanvasRenderingContext2D implements CanvasPathMethods;