Issue #2546 - Part 1: Remove BufferSource support in CreateImageBitmap.

dom/webidl/ImageBitmap.webidl

@@ -10,25 +10,17 @@
  * http://w3c.github.io/mediacapture-worker/#imagebitmap-extensions
  */
 
-// Extensions
-// Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
-// underlying image data
-//
-// Note:
-// Our overload resolution implementation doesn't deal with a union as the
-// distinguishing argument which means we cannot overload functions via union
-// types, a.k.a. we cannot overload createImageBitmap() via ImageBitmapSource
-// and BufferSource. Here, we work around this issue by adding the BufferSource
-// into ImageBitmapSource.
-
+// This is needed because we don't support SVG element as canvas image source.
+// See bug 1500768.
 typedef (HTMLImageElement or
-         HTMLVideoElement or
          HTMLCanvasElement or
+         HTMLVideoElement or
+         ImageBitmap) CanvasImageSourceExcludedSVG;
+
+typedef (CanvasImageSourceExcludedSVG or
          Blob or
-         ImageData or
-         CanvasRenderingContext2D or
-         ImageBitmap or
-         BufferSource) ImageBitmapSource;
+         CanvasRenderingContext2D or // This is out of spec.
+         ImageData) ImageBitmapSource;
 
 [Exposed=(Window,Worker)]
 interface ImageBitmap {