Use origin of source document for MessageEvent resulting from postMessage

[jdm]

Right now Window::post_message passes None as the value that will initialize MessageEvent.origin. The spec says this should be the origin of the source document that posted the message instead. We will want to add a new origin argument to Window::post_message, and store the origin in ScriptMsg::PostMessage as well so the code path in DissimilarOriginWindow::post_message also works.

This should allow tests/wpt/web-platform-tests/dom/events/EventListener-incumbent-global-1.sub.html to make more progress.

Code: components/script/dom/window.rs, components/script/dom/dissimilaroriginwindow.rs, components/script/script_thread.rs, components/script_traits/lib.rs
Test: ./mach test-wpt tests/wpt/web-platform-tests/dom/events/EventListener-incumbent-global-1.sub.html

[EllaLiu5]

Assign this to me please.

[jdm]

@EllaLiu5 Have you made any progress? Do you have any questions?

[yashpatel5400]

I'd be interested in trying this out!

[jdm]

@yashpatel5400 Did you make any progress? Are you still working on this?

[mmiecz]

Hey, it appears that no one is working on this one. If that's ok I can look into this task.

[jdm]

Please do!

[jdm]

@mmiecz Have you made any progress on this?

[mmiecz]

Yes, the test is passing now, but I still have to clean up the code ( remove unwraps, etc. ). I will create PR soon, so you can make some comments, because I am not entirely sure about the solution.

[mmiecz]

Hi, I am having some hardware problems since I’ve upgraded recently and I can’t boot to Linux where I have my servo code :( I am trying to resolve this issue right no, sorry for the delay!

[mmiecz]

I've created a PR but I see it's already done?

[gterzian]

@mmiecz Yes you're right, this was already done in #23637, sorry I wasn't aware an issue was open for this.

I think you could re-use some of what you've learned so far on this related issue: #24454

[jdm]

Closing since this was fixed by #23637.