Portals: Add test for portals in devtools context selector

Follow up to https://crrev.com/c/2404384.

Bug: 1127046
Change-Id: I282557314ec24e505cd04fa2ad28976d99930740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414411Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807865}

third_party/blink/web_tests/http/tests/devtools/portals/portals-console-expected.txt

@@ -4,6 +4,8 @@ Running: testMainConsole
 !!window.portalHost = false
 window.location.pathname = "/devtools/portals/resources/append-predecessor-host.html"
 
+Running: testContextSelector
+
 Running: testPortalConsole
 !!window.portalHost = true
 window.location.pathname = "/devtools/portals/resources/append-predecessor.html"

third_party/blink/web_tests/http/tests/devtools/portals/portals-console.js

@@ -28,6 +28,15 @@
       next();
     },
 
+    async function testContextSelector(next) {
+      const selector = Console.ConsoleView.instance()._consoleContextSelector;
+      TestRunner.assertEquals(selector._items.length, 2);
+      const executionContext = selector._items.at(1);
+      TestRunner.assertEquals(selector.titleFor(executionContext), 'append-predecessor.html');
+      TestRunner.assertEquals(selector._depthFor(executionContext), 1);
+      next();
+    },
+
     async function testPortalConsole(next) {
       await setContextLabel(targets[1], 'portal');
       ConsoleTestRunner.changeExecutionContext('portal');