tree 4a2040472c24e7cfa8676eecf596b97ff2863935
parent 73c8b303e2c3e7eb887b72178a0732bf54ea103f
author Dominic Farolino <dom@chromium.org> 1696481932 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1696482947 -0700

DOM: Add Observable SubscribeCallback functionality

This CL adds the SubscribeCallback type and invokes it when the
subscribe method is called. It also adds some rudimentary `Observable`
constructor tests that were ported from
https://github.com/web-platform-tests/wpt/pull/42219 into this CL.

The results are very limited because we haven't introduced the
`Subscriber` interface yet, or the corresponding `Observer` dictionary
event handlers. Those will come in another CL. For now, this just
implements the Observable subscription invocation semantics as well as
the report exception semantics.

For WPTs:
Co-authored-by: ben@benlesh.com

R=masonf@chromium.org

Bug: 1485981
Change-Id: Id32a21ed943908e3a2e61d50261a1b4b3fbd5e97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4904686
Reviewed-by: Mason Freed <masonf@chromium.org>
Commit-Queue: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1205647}