847357 - Don't throw exception in canvas drawImage with incomplete/no image

Status: NEW

(Core :: Layout, defect)

Description

[Robert O'Callahan (:roc) (email my personal email if necessary)]

According to the spec, http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-context-2d-drawimage, we shouldn't throw if the image is still loading but incomplete. This also applies to a MediaStream that hasn't produced an image yet.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21173 suggests a spec change in this area, but we still shouldn't throw in these cases.