Bug 1631148 [wpt PR 23082] - Screen Enumeration: Add a placeholder Screen.id to replace Screen.name, a=testonly

Automatic update from web-platform-tests
Screen Enumeration: Add a placeholder Screen.id to replace Screen.name

Use placeholder ordinal ids for now (0, 1, 2, ...); update tests.
TODO: generate per-origin UUIDs that reset when cookies are deleted

Test Screen.id values returned via window.getScreens() with:
 chrome://flags#enable-experimental-web-platform-features OR
 $ chrome --enable-blink-features=ScreenEnumeration
Try https://michaelwasserman.github.io/window-placement-demo

Bug: 994889
Test: Automated, Screen.id placeholder values
Change-Id: I0c5b18b92fef251211822f3473ea85472a7ee945
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155113
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761040}

--

wpt-commits: f8d36b93adcfb21622c935a77427bf99caf3d1e3
wpt-pr: 23082

testing/web-platform/tests/screen_enumeration/getScreens.tentative.https.window.js

@@ -25,5 +25,5 @@ promise_test(async testCase => {
   assert_equals(typeof screens[0].primary, 'boolean');
   assert_equals(typeof screens[0].internal, 'boolean');
   assert_equals(typeof screens[0].scaleFactor, 'number');
-  assert_equals(typeof screens[0].name, 'string');
+  assert_equals(typeof screens[0].id, 'string');
 }, 'self.getScreens returns at least 1 Screen');