Bug 1865927 [wpt PR 43295] - DOM: Introduce SubscribeOptions for Obse…

…rvable API, a=testonly

Automatic update from web-platform-tests
DOM: Introduce SubscribeOptions for Observable API

This PR separates the AbortSignal from the callbacks passed into
`subscribe()` via the `Observer` dictionary, into its own dictionary,
where future options may live. This is a particularly useful ergonomic
change for chaining Observables together.

See WICG/observable#85 and
WICG/observable#71 for any relevant design
discussion.

R=masonfchromium.org

Bug: 1485981
Change-Id: I9b9f9cf26cb8b7a71d2aab7811ad681386cbfd5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5046377
Commit-Queue: Dominic Farolino <domchromium.org>
Reviewed-by: Mason Freed <masonfchromium.org>
Cr-Commit-Position: refs/heads/main{#1227666}

--

wpt-commits: dbd13167a668830be3817fa612b2f00299d3cd76
wpt-pr: 43295

UltraBlame original commit: 4e0693e5004ddbf96ffd35d00ffd72526b384f90

testing/web-platform/tests/dom/observable/tentative/observable-constructor.any.js

@@ -1165,6 +1165,8 @@ source
 subscribe
 (
 {
+}
+{
 signal
 :
 AbortSignal
@@ -1255,6 +1257,8 @@ source
 subscribe
 (
 {
+}
+{
 signal
 :
 controller
@@ -3791,6 +3795,8 @@ complete
 )
 '
 )
+}
+{
 signal
 :
 ac
@@ -4058,6 +4064,8 @@ push
 complete
 '
 )
+}
+{
 signal
 :
 ac
@@ -4534,6 +4542,8 @@ source
 subscribe
 (
 {
+}
+{
 signal
 :
 ac
@@ -5487,6 +5497,8 @@ push
 complete
 '
 )
+}
+{
 signal
 :
 ac